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Questions tagged [alternator]

An engine accessory which generates alternating current (AC). The electricity is then fed through diodes which converts it from AC to direct current (DC), which is usable by the automobile in general. The alternator is usually driven by belts which are connected to the crankshaft of the engine which provides the motion to produce power.

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ABS and Brake light fault after battery disconnected

I bought a new battery that ran flat after two weeks. Took it back to the garage and they disconnected negative from my battery whilst the engine was running to check my alternator but now I have ...
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Battery Charging Fault

Renault Grand Scenic 2010 MKIII (I believe). I've had this problem for 2 years now, I had battery replaced and had it tested several times but no one seems to find the issue. There is no clear ...
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Little/no charging but alternator and battery test good

For the past few months, and seemingly getting progressively worse, I've had a charging problem: both battery and alternator test good (checked via charger with alternator test mode and higher-end ...
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Car starts when jumped but will not start again after turning off

2006 VW GTI 220k mi. 1yo battery. Starts and runs fine after jumping, but once I turn the car off it will not start again. No lights come on the dashboard, wont even click on attempt to start. Is ...
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Alternator issues

Any help...I’m out of ideas. Alternator issue, getting too hot to touch. Any help would this would be greatly appreciated: Wiring as is, (alternator neg grounded to engine, positive to starter, ...
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Anti Pollution Faulty

I have a 2006 Citroen C2 VTS ... At first it did not start and I exchanged the coil pack and the car was fine. Took it out for a test drive a few blocks down the road it cuts out. I switch it off and ...
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How is the battery on my riding mower charged?

I just started my riding mower for the season and in doing the basics (oil change, spark plug, air filter cleaning, take the trickle charger leads off) I was looking at the mower and realized I didn't ...
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Battery light still on after alternator change?

I hope I'm allowed to post this here... If not please disregard and know that I'm sorry. My 2004 Mercury Monterey broke down last night (all electronics shut off and it came to a sputtering halt) due ...
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1998 Suzuki Intruder 1500VL Back Fires After Replacing Alternator

The bike has ran fine for around 100 miles just days before I replaced the alternator / magneto because it wouldn't keep the battery charged and would barely maintain while running high RPM's. ...
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Alternator belt whining when plugged in only

There's a friend of mine who has a car (2007 Suzuki Swift petrol 1.3L DOHC 92hp) which has been making a whining noise for a while, the alternator belt broke once few months ago, and during it was ...
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Should I Replace The Alternator or Try Something Else First?

I have a 2012 Mercedes Sprinter 2500. I had a no start morning a couple times in the last few weeks and finally the battery would hold no charge. I took it in and was told it came back as need to ...
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Alternator amperage to charge 3 batteries

I have a 2009 accord sedan, with a sound system installed. How many amps should my alternator be to charge my 3 batteries? My OEM alternator currently puts out 130.
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Mazda DP alternator problem Replaced regulator now car swings but doesnt start Seems like no spark

ECU controlled alternator Could it damage ECU if the pin was left in the brushes after assembly? After new DP regulator was fitted car has no spark.
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12v starter battery True amps available why volts come back so fast by running engine 5 mintues?

The OEM start battery on my new van is 70AH, 120RC. I have a 12v freezer that consumes about 3amps @ 12v. It takes the freezer about 6 hours to freeze a gallon of water. My battery is not a deep ...
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Exciter Circuit Oddity

When doing a timing Belt job in my 1987 Porsche 928, we cleaned up the engine bay and made sure the electrical loom associated with T18 (an under the hood terminal connector) was routed and secured ...
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2001 Crown Victoria alternator exiter wire

My 2001 Crown Victoria appears to have a short somewhere in the harness which is going to be hard to find. As a temporary fix - can I connect the alternator exister straight to the battery? Is it ...
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2002 Subaru Legacy GT - New Alternator, Battery Light Stays On

I recently had to replace my alternator as the one original to the car died after 180k miles. The new unit is a Subaru re-manufactured alternator purchased from the dealership. The original failure ...
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alternator overcharging

I had a bad TPS on my 2009 Montana. I replaced it with a used scrap-yard TPS and the car runs great now. However, now my dashboard meter reads 15v. It's the uper limit, but it used to be 14.2v ish ...
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Problem with starting a car

I had a problem 7 days ago: I could not start my car. Temperature on that day was -17 (-27°C ). I heard just 1 click and that's it. One day later it was 32F (0°C) and I could start the car. I could ...
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Isolator or Separator for my Hitachi alternator

I am looking to charge an auxiliary battery for my motorhome, but am not sure if I can use an isolator given the alternator. It is a Hitachi LR160-78B 60a alternator in a 1985 Nissan 720 pickup (...
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Dual alternator setup that is separated one alternator and battery runs the truck one alternator and battery runs the audio system

Hey guys I'm JD and I've got a 2008 Chevy Silverado extra cab 4 by 4 flex fuel truck with a 5.3 l vortec I have added a second alternator and second battery!! Separated the way this thing works the ...
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I accidentally hooked the negative side of the battery up firstand the wire running to the alternator started to smoke

I accidentally hooked up negotiate cable to battery first causing the wire running to the alternator to smoke. I quickly unhooked it and hooked it up positive side first. But now my car won’t stay ...
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Is a 13.07V alternator voltage too low?

I'm having some problems with a 2006 Mini One D (1.4 l diesel engine). About a month ago the alternator warning light turned on (it only turned off over about 4000 rpm). The belt looked good, so I ...
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S10 won't start

I have a 2002 s10 that won't start. I had work done to repair an oil leak, drove it home, and it died. Thought it was maybe the battery, which had, in fact failed. I replaced the battery, and it ran ...
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1990 F-150 Eating Alternators

My old truck has a problem with zapping alternators. It's a 1990 F-150 with a 5L V8. Specifically, I believe the voltage regulator is going out. Giving it a lot of gas seems to always be the event ...
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Battery dead. Why won't my car start when jumped?

I have a 2007 Lexus ES350 with about 185K miles on it. I've owned it for about 14 months, never had a problem. Over the past couple of days it was sitting parked in my garage. I'm not sure, but the ...
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What is wrong when the car dies after you take off the jumper cables on a 2010 Kia Optima?

What is wrong when the car dies after you take off the jumper cables on a 2010 Kia Optima?
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157 views

Camry new alternator and battery, car wont start

I have a 2003 toyota camry xle, recently the car has died after the battery light came on. the battery read 12.5 volts and after jumping the car and removing the battery it died suggesting the ...
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Starter motor or Alternator?

Can anyone offer any advice? Got in my car on Monday and it was dead. I turned the key and there was no noise at all, but all the lights etc came on. No clicking or anything. I got a jump start and ...
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725 views

New alternator whining?

I have a concern about a new alternator I put on my 02 echo, again it too does not have a tensioner. Belt tension is created by pivoting the alternator away from the engine. This was the first time ...
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Boat Alternator Charging 4 Batteries 70 Amp Draw 50 Amp Charge

This is the current situation, looking for some expert advice. Total amp draws with night time running lights + GPS + other accessories I am at about 70 amps. My alternator puts out max 50 AMPS ...
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293 views

Voltage measurements with the alternator running fluctuate

I own a 1994 Mazda Protege. On Sundays, I measure the voltage at the battery terminals, and register it. First with the car turned off, and then with the car idling. The voltage with the car turned ...
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Alternator voltage constant with revs and battery light on

I recently installed a new aftermarket alternator in my 2006 Lexus is250 and checked the battery to make sure it was good. After installation, the charging system warning light is on and I can't ...
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Alternator issues?

I have a 2005 GMC with a 5.3 vortec engine. The alternator failed and I replaced it with a used one out of a previous GMC I still own. It would not charge more than 12.45 volts below 1000 rpms. At ...
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159 views

Is it possible to charge a small auxiliary battery with the alternator?

I want to charge a small 22AH AGM auxiliary battery just to turn on some light signals. I would like this battery to be charged by the alternator while the car is running. The problem is: the battery ...
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Alternator misconnected, what adverse affects

Spent the night and the very early morning in the garage changing the clutch on my wife’s 1997 Mk3 Golf GTI 8V 2.0. She’s called me saying the battery light is staying on. When I’ve thought about it,...
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Could installing a 12V radio on a JDM Simpa damage the battery and alternator, causing the alternator to put out no charge?

I am a Canadian living in France. I bought a "voiture sans permis" (JDM Simpa) for my son to go to and fro school... It is essentially a very small motor vehicle which can only go up to 80 km per hour....
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can a brand new car battery cause my alternator to fail?

My battery cavity filled with rain water due to a leak in my tail light of my 328i bmw wagon, and when my mechanic replaced the battery he said the new one was putting out too may amps and then fried ...
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Is it normal for car battery to drain this fast or is something causing this?

My i10 ever since i got it years ago had battery problems. If left for 4 days after a short trip, it discharged enough to not start again without jump starting. If long trip then expect 2 weeks. Is ...
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Causes of 2012 Honda Civic alternator not charging battery unless headlights are on

What are the possible causes of a battery charging only when the headlights are on in a car with both a new battery and a new alternator? A couple months ago, my 2012 Honda Civic LX wouldn't start ...
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Wire loom clip behind Lexus alternator has little play

I was following along this lexus alternator replacement tutorial, and at 12:32, the guy uses a 10mm wrench to release the clip on the alternator L bracket very easily. I used his trick with much ...
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Considerations when handing over botched DIY alternator/electrical repair to a mechanic

I tried following an in depth guide my my exact car for replacing an alternator. I intended to first replace alternator brushes, and then replace the alternator if brushes were not sufficient. After ...
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Alternator charging light on, turned itself off after about 15 minutes of driving

I just picked up a 98 Explorer XLT that had been sitting unused for about six months. I had to drive it from the SF bay area to Orange county, which is about a 400 mile drive. When I first started the ...
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Briggs alternator identification

These are pics of the alternator, yes I have looked at the Briggs guide, the most similar one I’ve found is the 397880 but this does not have the capacitors on it. I’ve spent hours looking so maybe ...
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254 views

Hyundai Accent 2013 Battery/Alternator Issues

I have a 2013 Hyundai Accent Hatchback. I have had a recurring issue with either my battery or alternator. Here is the history of the problem: About a year and a half ago, the battery died while ...
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1answer
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'91 Toyota Celica GTR (ST183) charging diagnosis

I've been working on getting a Celica up and running after a couple years of laying mostly idle, it's been dry-stored for most of it. The biggest issue I have right now is that the system is not ...
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Could a wind turbine work for a car?

Could I attach a little fan to power a motorcycle alternator to be more efficient then running off the engine? Attach any where facing the wind on the vehicle to increase mileage from eliminating ...
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Alternator regulator gone bad 3x in one day

I have a 2008 Toyota Camry 2.4l. My problem is battery is over charging causing amplifier ground wire to blow fuses and also melt the wire, battery tested it is good. Tested alternator and tested bad ...
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112 views

Could a car be slowed by the drive shaft?

Could enough electromagnets be place around the drive shaft to slow a car and generate electricity? Or a switch that would engage electromagnets going down hill? When you apply the brakes the drive ...
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1986 Nissan D21 Connector Part

What is this? As a hint, I'm losing about 2 volts between the alternator and the positive terminal of the battery here. It appears to be the last connection on the way back to the battery, just after ...