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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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1answer
21 views

Any benefits of a relay over a dead mans switch between two 12V batteries apart from preventing discharge of starter while car is off?

I am fitting a second "leisure" battery in my car. It will be a 12V 115-150Ah AGM lead acid battery for use when the engine isn't running with loads up to 500W, generously, in practice It will be 250W ...
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59 views

What is the Problem

I have a 2004 Chevy Trailblazer EXT. I was driving down the road and my battery light came on. I didn’t know what it meant but I kept driving. Then my lights became dim and I pulled over and parked at ...
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23 views

Odd noise from top of engine

I'm helping a friend with their car. Its a 2014 Mazda 2, 1.5L engine, approx 105K miles. The car has been well maintained with regular oil changes. There is an odd noise coming from the top of the ...
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34 views

Charging Battery Pack with alternator

I'm thinking of making a car battery with 3.7 V Li-Ion batteries arranged in 4s configuration (14.8 V). Would an alternator that produces 13-14 Vdc be able to charge the battery pack at all? Thanks
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38 views

Toyota Matrix 2012 – Can I assume a running alternator must supply perfect electricity even if the battery is dead?

I have a 2012 Toyota Matrix. It is very similar to Corolla. The car struggles to start, and my first guess is to simply replace the battery. However, when the car starts (means car alternator ...
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47 views

voltage starts at 14 every morning but then drops below 12 shortly after driving

Just bought a 1998 Nissan Frontier. It has a new alternator. For a while I was getting shorts at the terminal connectors so I replaced both. That seemed to fix the short but then I started having ...
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42 views

Help diagnosing start up/battery drain problem

Ii previously asked this question New batteries keep getting drained, any ideas of cause? Sorry was not sure how to link question. Anyway I got a multimeter and here are my findings. Firstly the ...
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50 views

Alternator intermittently outputs 12.6V

I have a 2005 accord and have recently had the alternator and the battery replaced from the honda dealer. I then install the voltage meter on the cigarette lighter port. I notice the voltage output is ...
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61 views

Trying to Figure all this out before I spend a lot of money

I have a 2008 VW Jetta 2.5L Automatic , Recently the battery was dead and my car would not start. I charged it up and got it to turn over and let it run for about 15 min on its own. and everything ...
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31 views

Car engine got wet through low water pass - any potential unseen damage?

Last night it was raining hard. There was a bridge that was flooded but I couldn't tell because the ruler marker sign was knocked down. As I approached it the car got deeper and deeper into water. ...
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if my alternator was tested and functioning properly why does my battery and brake light keep coming on in a 08 nissan altima 3.5

started my 08 Altima and put it in gear and it didn't have the power to go anywhere and then the car just died. bought a new battery and everything worked fine. now my battery and brake light on the ...
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20 views

How do I set the upper cutoff voltage for a car alternator charging the car battery?

With sustainability in mind, and trying to do something new, I am looking forward to charge my car battery using Solar Power, without making much changes to my car's electrical system. Basically I ...
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46 views

electrical voltage drop

I have a volt meter gadget plugged into the cigarette lighter socket. It used to read at 14.3 volts when the car is running. Suddenly it dropped to 11.2 volts without any accessories or lights on. I ...
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26 views

Squealing, smoke, and oil on engine

I recently bought a 2005 Ford Focus, only had it for 2 weeks and never had any start up issues or weird noises, yesterday I went to the movies with some friends and after a 16min drive to the theater ...
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639 views

Can starter be used as an alternator?

There's probably a legitimate reason why we have 2 different parts for doing 2 different jobs. However an electric motor can also be used as a generator. If the design allows it, why isn't starter ...
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41 views

Alternator sudden voltage drop after engine running for 2 minutes

My battery lamp in the gauge cluster turns on after the car have been running for approx 2-3 minutes. I have measured the voltage and when I start the engine and when it's running for the first 2-3 ...
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57 views

How can I test alternator

The voltage of my car battery is not fixed when AC going to active. In fact, I saw that the voltage dropped when the compressor clutch turns on. I suspect alternator and battery. Now I want to test ...
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2answers
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Can an alternator maintain a good system voltage (14 volts measured at battery terminals) but not be supplying enough current?

I'm reading a car electronics textbook that claims that an alternator can maintain correct system voltage (say, 14 volts) when under load, yet not be outputting enough amperage. I can't understand how ...
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Alternator dying so junk car?

The alternator store rounded the bolt on my alternator so I can’t get it off my 2004 g35x. I changed the belts (there are two one for ac and one for alternator) since I did that the car has a voltage ...
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30 views

2002 Mercury Mountaineer V8 4.6 2W Drive

While driving on freeway going 75 MPH using cruise control, my engine stops running. I still have lights and power but no power steering or power brakes because engine was off. I put it in neutral and ...
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45 views

Alternator problems: First too much voltage now not enough

I had to put in a new alternator in my 99 Isuzu Amigo. The old one burnt up. Everything seemed fine...output was around 14.4 volts, however, the plug that goes to the "S" & "L" terminals on the ...
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61 views

How can a battery indicator be on when the alternator is providing adequate voltage?

I'm under the impression that the battery light indicates that charge is flowing "out of" the battery. Normally the battery is being continuously overcharged by a couple volts, meaning that electrons ...
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23 views

2003 Mazda Tribute lost power

I have a 2003 Mazda Tribute with the V6. The battery light will occasionally come on, sometimes it just flashes, other it stays on. I had the battery and alternator checked at two different auto parts ...
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60 views

Charging two 12V batteries wired in series by two car alternators

I have a spare engine sitting around and i've been planning on building a 220V generator from it. I'll be using an old UPS device which uses two 12V batteries wired in series to make 24V and connect ...
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184 views

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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125 views

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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62 views

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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2answers
503 views

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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19 views

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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73 views

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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1answer
58 views

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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105 views

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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27 views

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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1answer
139 views

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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34 views

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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26 views

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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18 views

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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1answer
55 views

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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9 views

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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1answer
57 views

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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1answer
201 views

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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69 views

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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1answer
54 views

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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43 views

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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198 views

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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2answers
132 views

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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217 views

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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33 views

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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1answer
31 views

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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61 views

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 ...