My alternator is pumping out 16. At rest/ bus not running, battery voltage should be 12. In the scheme of things with an alternator volts and amps are proportional in full wave output. Since then its been happening more frequently and now i'm at the point where it needs to be fixed. Sounds like one of the field post on the alternator is getting full voltage, and/or one side is ground/shorted out. 5 and that its overcharging unless jags have a booster when the battery is low and asked if i smell burning when driving as its cooking the battery and suggested i take it to my garage to get it checked out !. How can an alternator be overcharging a battery ? My garage has told me my alternator is producing too high a voltage and over chargeing my battery "cooking it". If you experience flickering headlights, stalling or strange noises when driving, your car isn't haunted; chances are it's just a failing alternator. 5 and does not drop even after idling or driving for 20+ minutes. when the alt was overcharging and i turned truck off, it started 3 hours later with no problem. The overcharging concern when driving is 'Almost' a non issue. A bad or leaky diode in an alternator is a very common source of overnight battery drain. Mine was overcharging and making my headlights pulsate i bought a 100% new alternator and it solved all my problems, if everything else is fine its probably the reman alternators i heard of people putting in 8 different alternators till they found a good reman. Cause: The alternator tachometer signal level is very low or not present when the voltage regulator is not demanding current (amps) from the alternator. There is no way around this. Generators produce direct current -- similar to a battery, while alternators produce alternating current, similar to your house power supply. For some reason I have a 4. Having an issue with my G over charging. Usually, the first sign that your charging system is in trouble is a "battery," "ALT," or "CHARGE" warning light illuminating on your instrument panel while driving. Overcharging - This isn’t a problem with the alternator itself, but rather a problem with the voltage regulator (often built into it). Euro car parts simply exchanged the unit for me. An overcharging alternator will cause the voltmeter on the vehicle's dash to read an overly high voltage that may or may not vary with engine speed. x volts open circuit. NHTSA — Electrical System Problems. The process sounds. at idle, I am getting 15. Ford road side service came to jump it and I talked to the person (over the phone) who told me that the alternator was overcharging her battery and that's why it died. So, I went to Advanced Auto Parts to test the battery (if you did not know, AAP provides free battery charge and inspection, just bring it in, and those guys will do the magic). The alternator experienced a rapid failure: while driving on I-95 north through maryland at highway speed (~65 mph), the abs and steering control indicator lights began to blink on and off, joined shortly thereafter by the brake indicator. The overcharging concern when driving is 'Almost' a non issue. Q: My alternator is overcharging to about 14. The last time I changed out an alternator- was back in 1997 probably-- and that was a 1 wire alternator that went into my 1964 Chevy Truck. Follow this guide on how to test an alternator in under 10 minutes at home to ensure hassle-free driving. PART 3- Verifying that the alternator fuse in the fuse-box is not blown (if equipped). If the alternator becomes a load at low enough speed (or you hae enough accessories on to pull down the battery), then you could get voltages that are below the battery's 'nominal' voltage. The alternator is BRAND NEW and I just put it on yesterday. As others said, it is a question of how much current might be flowing into the battery that would cause problems. when you are driving should. If it is 14. Ford road side service came to jump it and I talked to the person (over the phone) who told me that the alternator was overcharging her battery and that's why it died. This has been driving me nuts, for years. The last time I changed out an alternator- was back in 1997 probably-- and that was a 1 wire alternator that went into my 1964 Chevy Truck. I need advice about a 1999 Ford Contour Battery and Brake light coming on and off, and the system overcharging?Sounds like loose or dirty battery cable connections. dunkinx wrote: how come during start up, my voltage only reads 12. I replaced the alternator with one that I got from a salvage yard (to save money) but it is still over charging at the same voltage. Checked the alternator and it's overcharging so I'm thinking it's sending some crazy voltage to the ecm and causing it to malfunction. 5k rpm, it does 14. It typically does this with either a series or a shunt regulating element. Example: shorts, overloads, ECM problems. The process sounds. I would guess that the alternator is probably charging the battery enough to start the generator sometimes after driving for a while, but the RV battery charger can’t charge it enough to start the generator when it’s plugged in. Even a 90Amp alternator regulates itself to not overcharge your car battery. Manufacturers of charge controllers also seem to worry way too much about over charging, which is very difficult to do with the limited amps produced by most RV solar systems. Mine was overcharging and making my headlights pulsate i bought a 100% new alternator and it solved all my problems, if everything else is fine its probably the reman alternators i heard of people putting in 8 different alternators till they found a good reman. Last night was the worst. Driving The 2018 Mustang With The Performance Pack Level 2 Option. Need to know whys is a new GMC alternator not charging? Need to know what can cause an alternator to overcharge? How can GMC alternator problems be diagnosed? These are some of the common questions that vehicle owners are often faced with. My 2011 Dodge Durango, 3. There is also a 'minor' problem in that it could blow all your onboard computer equipment. Been online since then seeking answers. As I understand it, the voltage regulator keeps the voltage output by the alternator at that level (around 14. My son's 2003 Focus died while driving on the road. The voltage regulator is shorted, which is fairly uncommon, or the control wire going to it is grounded. Checking Alternator Voltage Output with a Multimeter. Ford road side service came to jump it and I talked to the person (over the phone) who told me that the alternator was overcharging her battery and that's why it died. Have the alternator REALLY tested; this isn't difficult for a car parts place to do, and the results are pretty definitive. ALTERNATOR INSTALLATION, Any Style - AC-201. Also, it is the Ford Style Alternator. The dash illumination light would randomly alternate from super bright to dim. It wastes off excess energy as heat through a resistor, it switches in when the engine is revving hard making lots of power but you've got a well charged battery and aren't running, lights, wipers, radio, etc. With most applications, the battery likes about 14. hey, took the alternator off and had it checked,it was confirmed to be overcharging. 8L Buick, Chevy, Olds, and Pontiac equipped cars and mini-vans. Our moving trucks have more safety features than. Frequently when starting the car I have the drivebelt squealing as the alternator tries to get the battery voltage up (I have changed the drivebelt to a brand new one and tried CRC Belt Grip). It converts alternating current (AC) to direct current (DC). Since then its been happening more frequently and now i'm at the point where it needs to be fixed. The alternator is a key component in your car's electrical system, turning the energy from the crankshaft into useful electricity to power your vehicle's electrical systems and to help the battery recharge. Have the alternator REALLY tested; this isn't difficult for a car parts place to do, and the results are pretty definitive. 5 volts)! If I were to drive for several hours at this point, I would certainly do damage to the AGMs, which are said to be sensitive to overcharging!. The most uncomfortable part of driving my XJ is when a car overtakes me. Hey guys, I know I'm a little late here, but I am having the same problem with my 240z and I have gone through the same process Josh went through. Does that mean it is basically either an AC Delco or Bosch alt with a different manufactures casing?. PART 3- Verifying that the alternator fuse in the fuse-box is not blown (if equipped). The chrysler engine has all new wiring and a newly rebuilt engine. Put a new alternator on it last winter, and it has the original Delco battery. Keep in mind with colder temps, the alternators will put out higher than "normal" voltage to drive a charge into the battery. Here are tips on how to keep your Honda Accord alternator functioning well: Make sure it gives off enough electrical. How can an alternator be overcharging a battery ? My garage has told me my alternator is producing too high a voltage and over chargeing my battery "cooking it". It allows the car to charge the battery while it is in motion, keeping the car in its full operating state throughout the entirety of the trip. The smart thing to do was to replace the whole thing. Batteries like to be charged in a certain way, especially when they have been deeply discharged. If a loose bolt breaks the connection, the alternator's voltage regulator can overcharge the battery and destroy the entire electrical system. My alternator is overcharging. I had a similar experience with my '04 shortly after purchasing it. If an alternator has a faulty voltage regulator internally then it could and would over charge a battery and dry up it's cell's. Normal readings should be high upon start-up, then settle into the normal range. This was the original alternator with 255K miles on it, I noticed the housing was cracked in multiple places so I opted but buy a rebuilt. Again the terminal will be marked WL or IND. The alternator can comfortably make 100A at 2000 RPM. Symptoms of overcharging an alternator A vehicle's alternator serves dual purposes in the proper operation of a vehicle's electrical system. It's coming out so violently, there's even acid/corrosion on the underside of my hood but the car seems to be driving fine. A problem that is not as easy to diagnose is overcharging, which occurs when the voltage regulator fails to limit alternator output. The regulator/rectifier changes, or rectifies, the alternating current produced by the alternator into direct current so it can be stored in the battery and regulates the amount of current produced to prevent overcharging. Alternator, oil, and radiator lights all come on while driving. We stress that the advice on this page is for general guidance only. I have grounded the alternator, added another ground strap to the engine, added a ground wire to the volt regulator, and I thought I had the problem licked, it was showing normal charging, but after 2 hours of driving, it started overcharging again. At idle the battery coil has its circuit open, just off idle that circuit closes and it starts overcharging and as I said before the voltage gas gone to nearly 20 volts. The regulator senses the voltage of the car's electrical system and controls the current that is in the rotor of the alternator. The battery charging light may illuminate if the alternator is not charging or if a wiring fault exists. TOM: And the reason your mechanic sold you an alternator is that in most modern cars, the voltage regulator is built-in to the alternator. x volts open circuit. An overcharging alternator, however, will cause the meter to remain in the high position after initial start-up. Hope this helps your figure it out!. This issue can also be caused by an electric surge through the battery—for example, when trying to jumpstart your vehicle. The charging output of the alternator drops when diodes fail. Replaced the alternator and everything is cool, but I'm keeping an eye on it. 7 is within specficiations. 3 volts, and recharges the battery to its original state of charge. A voltage regulator is usually part of the alternator, and is used to keep a steady flow of voltage to the battery. Hello All! I have a 1995 Geo Metro 3/5 and in June I had my alternator replaced because the voltage regulator was bad as the voltage would jump around from good to over charging and the car would surge when you drove it. The car starts up fine every time. Your charging system is responsible for restoring the charge to your car battery after use and is tasked with providing power to your lights, audio system, and other electronics while your vehicle is running. I took the car to my local Ford dealer and asked for a quote to replace the alternator. > Well, if the alternator isn't properly sensing > battery voltage, that could be the source of your > problem. So if you need help, check out the video above and good luck!. I was driving on the freeway and again the dashboard started flickering and. Does that mean it is basically either an AC Delco or Bosch alt with a different manufactures casing?. So, I agree with having the alternator tested. Even with smart charging disabled there shouldn't be more than about 15v at the battery. 5 and that its overcharging unless jags have a booster when the battery is low and asked if i smell burning when driving as its cooking the battery and suggested i take it to my garage to get it checked out !. Because I didn't know that was one of the possible symptoms of an alternator about to give out (overcharging) I blew many, many things, including the 100 amp fuse. Here are a few diagrams to help you understand the alternator wiring on your 4AGE when doing your engine conversion. Just be carefull when you take the terminals off that battery, they can literally explode in your face. PART 2- Testing the continuity of the alternator's output wire (to the battery) with the multimeter in OHMS mode. When the car is idle or is in slow motion, the lights inside the cabin as well as the headlights are dimming intermittently. The first is the alternator output rating, which is the amount of current that a unit is capable of producing at a specific rotational speed. Paying attention to the 10 trouble signs on this list can make it a little easier to diagnose car trouble caused by the alternator. Alternator, oil, and radiator lights all come on while driving. Hello, I own a 2008 Honda Ridgeline. Normal would be an absolute max of 14. It happens when I accelerate. Hmm seems it is overcharging. What else do I check and how do I check it. Connect wires one at a time to see what lead is drawing current. Later that week I replaced the alternator and the car was back to normal. The attitude in much of the solar industry seems to be that their factory settings are “close enough”, which is absolutely not true. I hoping I got the the issue resolved? I am not sure because the voltmeter fluctuates some. I managed to pick up an engine with only 36K on it. An overcharging alternator, however, will cause the meter to remain in the high position after initial start-up. In other words, a bad electrical smell will help you narrow down the source of your trouble, but it's possible the alternator could be failing without any of these accompanying odors. Normal readings should be high upon start-up, then settle into the normal range. was an adjustable voltage regulator, long haul trucks were set at 14. At the time it was at night so the headlights were on as well as the A/C, radio, etc. While driving at night, the alternator will produce enough power to not only run the lights, but you can blow your horn and it won't sound like a sick calf. Take that alternator back to the store for testing and most likely replacement unless you have miss wired it. Anyone experience this? Leaving it with my audio guy next week while im in the Bahamas so he can get it all fixed but wondering if. A properly operating alternator will keep the vehicle's battery in a fully charged state, and it will supply additional electricity for the operatio. I replaced the alternator and the problem persists. I did attempt to look for a sense wire from the alternator but all the cables are wrapped in sleeving and I will need to remove the engine cover to get a better look. But in my opinion, 8-amps would not be sufficient for effectively charging your battery bank. 6V and I'm charging my house batteries at less than 13. 5L Overcharging Alternator - car shutdown - - ProbeTalk. Another thing with charging systems and alternators is the alternator has diodes inside to convert the AC (alternating current) into DC (direct current) If one or more of the diodes goes bad the. (See BU-403: Charging Lead Acid. So would this alternator work fine with my 2002 Protege 5 and not damage my ECU? #3 I am looking into buying this alternator for my 2004 WRX with a 2. Its either a shorted battery cell or alternator. Alernator output varies with rpm, and the regulator flat out limits it so as not to cook the battery. It is designed that way because typical cruise is around 2000 RPM. The alternator provides a vehicle's battery with an even charge while driving, keeping the battery in excellent health. This costs as low as $8. Batteries like to be charged in a certain way, especially when they have been deeply discharged. 2V and never above 14. I want to charge a service battery in the car with the alternator and a solar panel, potentially both providing power at the same time (solar panel on the roof while driving). How can I test it and where is it located?. 3, I am having the weirdest charging problem, when coming to a stop my alternator drops to around 9-10 volts and it'll usually stall if I don't throw it in neutral and bring the rpms up, as long as I brake in neutral it's fine. If you can do the work yourself, a rebuilt alternator can cost as little as $80 for older vehicles. So I had my alternator & starter, along with a new battery changed around March of this year. Figured Id change the reg in the old one in winter and have it o. Is this happened during day time driving?. They just flat out give and don’t produce any worthwhile energy to charge the battery with. He was telling me that he did not think the car was safe to drive. One of the most popular ways of charging a 12-volt battery is by using a vehicle's alternator. Connect wires one at a time to see what lead is drawing current. There is no way around this. Technical and mechanical Q&A about Studebaker cars and trucks. It is still overcharging. Free Shipping by Amazon. If it's down around 12, then maybe you have a problem. You do NOT want to throw 14. Battery Recharging While Driving. Also, This is an aftermarket escalade. Automotive charging systems for flooded lead acid often have a fixed float voltage setting of 14. As others said, it is a question of how much current might be flowing into the battery that would cause problems. The Ford dealer told me that a diagnostic will be $120 for an hour's labor. Damage or wear to the belt that drives the alternator can cause it to slip and not turn fast enough. Symptoms of a charging problem include a low battery, dim headlights, hard starting or a charging system warning light. Think tnt with battery acid, toxic fumes, alkaline, and hellafied flames involved here if it blows. The only way the alternator would be the cause is if the field terminal was wired incorrectly directly to the battery voltage bypassing the regulator. ( B+ ) - Battery Post - Heavy gauge wire that connects to the battery. Rebuilding an alternator is a fairly simple procedure, which anyone with basic automotive knowledge can accomplish. Limped home about half a mile. but at idle at 800 rpm it sometimes goes down to 12. Keep in mind that the alternator is overdriven and spins faster than the engine crankshaft. Hi, I am trying to figure out if and how I can achieve the same/similar setup as with a Redarc BCDC1225D or ctek D250SA (SE); i. For instance, a 100A alternator has a “rated” output of 100A, which means that it is capable of providing 100A when the alternator shaft is rotating at 6,000 RPM. 0L Mercury Mountaineer isn't hard. You may wish to have the battery checked under load before replacing the unit, but it is possible that if the system has been overcharging, the battery could be an innocent victim as well. and acts like it is overcharging. Went to move it at lunch and the STOP light and the battery light illuminated. Re: Alternator Failure - Overcharging Ok, I finally got this sorted. Cylinder #2 died and that was it for that engine. I have a 2006 Buick LaCrosse with the 3. Disconnect. I replaced both the Battery and the Alternator and this still happens as well if the truck has been sitting in the hot sun. Junior Overachievment. I have not traced it out, but I believe that the alternator cannot become a load, because the rectifying diodes prevent any flow of current into the alternator. The battery is more than just a store for electrical energy, it ties the voltage down to lower levels than what the alternator puts out. Many reasons of car battery overcharging:- 1. A bad ground can also do this. sounds like it should be fine, back when I worked on over the road trucks the delco 24 SI alternator was the standard issue. The tach was also not tracking smoothly at all, very jerky. The alternator also powers up the car's electrical system during operation. My wife's Escape battery was dead again this morning. If you have a problem with persistant and perhaps intermittant overcharging, and have checked all the wiring and replaced the regulator to no avail - here's one more thing to try before pitching the alternator into the trash. A 1999-2002 S60, S80, V70 or XC70 model may exhibit alternator charging problems. Overcharging ==the alternator is not being propperly regulated. The voltage regulator is a simple switching device that keeps the alternator from overcharging the battery and, at the. If the alternator was ailing for a while, the battery may have been low for a long time, which also isn't good for a battery. The topic ‘Leisure battery – charging off an alternator’ is closed to. I purchased a Dixon 88AH battery around January 2017 and it performed fine for most of 2017 until one morning the Jeep would not start. I'm replacing the regulator tonight and my neighbor is a autolek. Flickering gauges. If the wire that goes to the Sense terminal is bad then the alternator will over charge just like a bad regulator. At rest/ bus not running, battery voltage should be 12. I replaced both the Battery and the Alternator and this still happens as well if the truck has been sitting in the hot sun. Question: We travel south in the winter with our fifth wheel and on the way down stay in Walmart parking lots. And you don't always know what you're getting when you buy a new vehicle. This causes the alternator to overcharge the battery, which in turn can ruin the components that use electricity. Hi, I am trying to figure out if and how I can achieve the same/similar setup as with a Redarc BCDC1225D or ctek D250SA (SE); i. Still would't start, so I replaced the ignition module on firewall near where the wires go thru the firewall. Sounds like the alternator might be on its way out! How old is the battery? How long have the Subs been hooked up? Were the subs installed with a large AMP and installed correctly? These are all questions you need to address and than based on your answers we can narrow it down but sure sound like an alternator. Please keep in mind that it is normal for initial readings to start high and then settle back down. 2005 Malibu Classic, 2. Testing the alternator, while still on your 1993-1997 2. Manufacturers of charge controllers also seem to worry way too much about over charging, which is very difficult to do with the limited amps produced by most RV solar systems. Keep in mind the factory cables weren't designed to handle the juice of a higher-output alternator, and can restrict the flow of electricity. I used a known good alternator and new voltage regulator. Installed a new alternator and the problem went away for a few miles, then when I was driving it last night and got on the throttle a bit the GEN light came back on and it began to overcharge once more. The charging system consists of the battery and cables, the alternator or generator, and either an external or internal voltage regulator. The battery is more than just a store for electrical energy, it ties the voltage down to lower levels than what the alternator puts out. This was the original alternator with 255K miles on it, I noticed the housing was cracked in multiple places so I opted but buy a rebuilt. #1 is the alternator "turn on" terminal. This belt goes around a pulley connected to the front of the engine's crankshaft and is usually responsible for driving a number of other components including the water pump, power steering pump and air conditioning compressor. I have a 2006 Buick LaCrosse with the 3. If it were true, every long-haul trucker would be killing batteries left and right) b) An alternator does NOT just put out one fixed voltage. A wiring fault such as a broken wire may cause loss of power, ground, or signal at one of the alternator multiplug terminals Fuseboard, relay plate, or ecu connection problems may also cause the battery charging system to fail. Overcharging - This isn't a problem with the alternator itself, but rather a problem with the voltage regulator (often built into it). "Fully charged" is an elusive goal, reached only after at least 2 hours of open road driving. Sounds like the alternator might be on its way out! How old is the battery? How long have the Subs been hooked up? Were the subs installed with a large AMP and installed correctly? These are all questions you need to address and than based on your answers we can narrow it down but sure sound like an alternator. Two weeks later the replacement tested overcharging, something to do with the bridge. We stress that the advice on this page is for general guidance only. Overcharging causes most of my electrical components not to operate, but the motor runs great. It is not uncommon for a 160 amp alternator to have a continuous duty cycle of less than 90 amps. I always thought my truck's alt was putting out too much, about 15-16 volts most of the time, settles to 14-14. at idle, I am getting 15. Normal readings should be high upon start-up, then settle into the normal range. 6V Normally flat at <=10. Turned it off and on again and it was still there. Battery overcharging is a common problem in vehicles. While driving it today the battery light came on and the guage was topped out. The alternator tach would sometimes stop then start working again, and the diesel wait light would randomly come on while driving. It happens when I accelerate. As I understand it, the voltage regulator keeps the voltage output by the alternator at that level (around 14. I used a known good alternator and new voltage regulator. Re: Charging while driving w/ generator via charger Just thought of getting enough juice to trickle charge the running batteries or maybe charge a 12 volt battery for radio, light, etc. My 2 year old batteries were dead yesterday morning for no apparent reason. Was driving along yesterday and the alternator light came on and the tacho and speedo all stopped working, I also got an ABS dashlight come on. My daughters 01 chrysler t&c started surging at idle. Replaced speedometer and vss. Installed a new alternator and the problem went away for a few miles, then when I was driving it last night and got on the throttle a bit the GEN light came back on and it began to overcharge once more. Another problem is a bad diode inside of the alternator. Re: alternator overcharging?? 08-24-05 01:00 AM - Post# 766238 In response to touredge Check what the battery has for volts when the truck's off, should be around 12V. But more importantly, you may experience difficulty in starting and driving your car, preventing it to fully operate. If it were true, every long-haul trucker would be killing batteries left and right) b) An alternator does NOT just put out one fixed voltage. Most claim that a 15 volt charge indicated is definitely signs of an alternator overcharging. Checked the alternator and it's overcharging so I'm thinking it's sending some crazy voltage to the ecm and causing it to malfunction. Driving at night and within a few seconds first the lights kind. So the other day when I was driving on the highway my alternator decided to fail, by the time I got to where I was going the batteries were down to 10 volts and I had no accessory power whatsoever (lights , radio, etc. You may notice your headlights getting dimmer than before. I want to charge a service battery in the car with the alternator and a solar panel, potentially both providing power at the same time (solar panel on the roof while driving). The fault may lie with the voltage regulator of the alternator. This went on for about 10 seconds before the vents suddenly began to blow hot air. Put one on before I changed the box to see if would help. Ignoring signs your alternator is bad can lead to catastrophic results. Later that week I replaced the alternator and the car was back to normal. They just flat out give and don’t produce any worthwhile energy to charge the battery with. If the alternator is overcharging the voltage regulator is bad, nothing more complicated than that. Run this test for One Full Minute. Even the smart chargers designed for variable voltage alternators generally only boost voltage from a minimum alternator supply of 9v or so. Alternators fail for a variety of reasons, but driving for long periods of time in hot weather is often the culprit. Does that mean it is basically either an AC Delco or Bosch alt with a different manufactures casing?. This short article deals only with correcting voltage. I had a similar experience with my '04 shortly after purchasing it. 1990 Honda Accord with erratic alternator I start my 1990 accord (245K miles - yeah baby!), and the alternator doesn't charge the battery. After a bit of research, I started looking into the wires coming from the plug on the side (Sky Blue and White/Red). 2 volts from the alternator and voltage regulator system, when driving. Today’s computer-controlled charging systems tailor the charging rate not only to the electrical demands on the battery and alternator, but also to changing driving conditions. This can be dangerous when driving at night or in zero-visibility. The alternator is driven by a belt that is powered by the rotation of the engine. I have repeated and heavy blue/white battery terminal corrosion--especially on the positive post, but has also migrated to the metal battery tie down. A lead acid battery is difficult to overcharge because of it's internal resistance. Does that mean it is basically either an AC Delco or Bosch alt with a different manufactures casing?. I'm not sure about cutting any wiring. Automotive charging systems for flooded lead acid often have a fixed float voltage setting of 14. How to Rebuild an Alternator. how do you plan on driving this. I was looking at them online and noticed some say with Delco alternator and some say with Bosch alternator. This article covers the majority of 3. "Fully charged" is an elusive goal, reached only after at least 2 hours of open road driving. (and this is on GM vehicles-- I dont know about other brands). On my 2000 alty when the alternator went the car just died so I wasnt sure if it was the alternator on my 05 since I expected the car to just die if it was the alternator. The voltage regulator is shorted, which is fairly uncommon, or the control wire going to it is grounded. 2 volts, then start your car and rev the engine to 2,000 RPM. Sounds like the alternator might be on its way out! How old is the battery? How long have the Subs been hooked up? Were the subs installed with a large AMP and installed correctly? These are all questions you need to address and than based on your answers we can narrow it down but sure sound like an alternator. You may wish to have the battery checked under load before replacing the unit, but it is possible that if the system has been overcharging, the battery could be an innocent victim as well. Com is a FREE online Mopar Truck, Jeep, Cummins & SUV Community built by a ton of great knowledgeable members. If your battery is completely discharged, recharge it with a charger rather than push starting the car and letting the alternator recharge it. I am looking for some advise on how to solve the battery mistery I've had with my 2009 Jeep CRD WK. If you have a problem with an overcharging battery on your RV, you may want to tune in for this video. To check an alternator, pop your vehicle's hood and hook up a voltmeter to the car's battery by connecting the red lead to the positive terminal and the black lead to the negative terminal. That fact is why automotive voltage regulators are designed to slightly overcharge a battery in order to somewhat compensate for short trip driving. I suspect that's why the battery light was on while driving. Took out the multimeter and measured between the + on the alternator and the casing. pls help Hi. If you can do the work yourself, a rebuilt alternator can cost as little as $80 for older vehicles. This article covers the majority of 3. The last year or so, it began to have trouble starting. Just be carefull when you take the terminals off that battery, they can literally explode in your face. An overcharging alternator can "boil a battery dry", so if your battery gets low on elecrolyte, making you add water to it, or if you car "eats batteries", you may have an overcharging alternator. Car batteries don’t like being run all the way down. 1987 911 Carrera Overcharging at the battery Electrical and Electronic I have noticed that the headlights& gauge lights, seem to get bright while I am driving, but only for a few minutes. Over the years, I've had several Lucas alternators develop overcharging problems. If the alternator case isn't getting a good ground to the block or the wiring in the engine bay is bad You can get overcharging or even blown. The charging system is putting out 14. 6 or close to that. Is this too high? Alternator over charging? Regulator not working correctly? How can I test it to narrow down the problem(if there is one?) Engine is a SBC with an original delco alternator and external regulator. Most important point first. This fixed the starting problem, however after letting it warm. 3 volts, and recharges the battery to its original state of charge. the battery is one year old. So, when the alternator stops working, then the batteries die as it has stopped charging. The question: Is there any way to test the whether it's the alternator that's failed vs the pigtail.