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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Citroen C2 Alternator

Please if someone could help me ill really appreciate it. I've got a Citroen C2 the Bendix of the starter was completely worn so we purchased a new starter and put it in. At first it started. Once ...
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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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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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Intermittent battery light on 2005 Accord

I have a 2005 Accord LX 2.4L w/ 101k miles and a few weeks ago, the battery light came on. The battery was changed last year. After checking everything, I concluded that it was a bad alternator, so I ...
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Dashboard lights dim when I step on accelerator

[Car: 2001 Kia Sephia, ~107,000 Miles] I just got a new alternator put in my car, plus had a lot of other work done. Now I notice my lights are dimming on the dashboard when I step on accelerator and ...
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2k views

Intermittent battery light after new battery and alternator

I had a small fuel leak on my 2009 Ford Galaxy which got into my alternator and killed it. It then drained the battery. I got the leak fixed, got a new battery fitted and a new alternator fitted (...
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871 views

How to replace an alternator on a BMW 3 series E46 320d (M47 engine)

I am trying to replace the alternator on a BMW 320d E46 with an M47 (diesel) engine. I know how to replace an alternator in general (I've done it before on another car where the alternator was a bit ...
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233 views

Ford Escape Alternator Working Intermittently

On my 2004 Ford Escape V-6, I replaced both the battery and alternator about a year ago. The alternator seems to be working intermittently now, and when it does work it only creates about 12.50 volts. ...
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722 views

battery light will not go out

I drive a 1983 Volvo 245 diesel. The alternator and battery are both less than 4 years old. A year ago, the battery light would not go out after starting. The alt is charging fine. A diode check was ...
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232 views

Is battery bus voltage available via OBD2 scanners for 98 Avalon?

In order to supplement the inadequate-by-design alternator BIT circuits in my 98 Avalon (alternator failures have stranded us; no instrument panel warnings of charging failure), I'd like to either ...
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209 views

Charging LiFePO4 with car alternator

I currently have this setup in my van: Alternator -> Car Battery -> Voltage Sensitive Relay -> Leisure Battery (AGM) I'm thinking of changing out my AGM battery with a LiFePO4 battery instead,...
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643 views

12V AGM battery charging voltage

I have the following 12V car battery: Varta Silver Dynamic AGM 595901085 (12V/95Ah/850A), and the following car: Jaguar S-Type 2.7D. In the technical cars manual it says this: So in cold winter ...
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Alternator: amperage when charging a car battery (and time to charge)?

What is the amperage of a typical car alternator when charging the car battery, and how long would the alternator take to charge it (let's take a 60Ah battery as an example)? I have seen multiple ...
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44 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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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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381 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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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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223 views

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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59 views

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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436 views

2002 Subaru Impreza WRX alternator/charging issues

I have 2002 Subaru Impreza WRX. The alternator went, so I replaced it. The voltage gauge was jumping up and down when fans kicked on and when I turned on accessories. I figured the alternator was ...
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71 views

What would make an alternator produce flutuating voltage

The car is a 2013 Seat Mii with start/stop functionality. The alternator is faulty as the output (measured at the alternator on an oscilloscope after the regulator) fluctuates between 3V and 14.5V in ...
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205 views

Is a self exciting high output alternator a bad idea?

My vehicle ('12 Accord LX 2.4l) has electronics that are constantly running: Compustar Drone & Compustar EZ-GO It seems as though, the ELD prevent the battery from charging, and simply maintains ...
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127 views

Diagnosing Engine Knock

My 2003 Volvo XC70 had a slight engine knock for about 5000 miles but never showed any signs of damage to the engine. Oil was fine and it only made the sound in around the 2500-3500 rpm range. One ...
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3k views

Battery light has been flickering for about a year now after replacing alternator and battery

After replacing both alternator and battery, I noticed the light flickering quickly for about a week, took it back to shop and they said everything looks fine. a year later it is still flickering. I ...
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Car won't start.

I have a 2009 pontiac g6 gt and my car will not start and I am trying to figure out why. Over the past few years I have replaced both the alternator and battery twice, and they both keep failing at ...
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Battery problem for paddy harvester

My harvester vehicle is Claas make. Model Crop tiger 40. I locally fabricated AC cabin for this vehicle. After AC installation, if my vehicle run one day in AC next day morning it is not getting self ...
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Alternator gone bad after collision repair

I have a 2011 Honda Accord (92k miles, being driven about 10k/less per year) that was recently involved in a low-speed front-end collision (I rear ended a car in front of me at a stopped signal when ...
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73 views

What happens if the main battery gets connected backwards?

2008 Mitsubishi Nativa (Pajero?) now no power coming from alternator after my experienced mechanic hooked up the car's battery backwards. He saw the spark he said but didn't register as he was ...
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44 views

12 to 24v charging with isolator

I'm trying to find the best way to charge my 24v solar battery bank off my 12v bus system. The simple way seems to be a step-up converter and a diode, but I'm wondering if I can replace the diode with ...
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53 views

What's happening with my alternator?

So, my car has blown up to 6 alternators thus far. Luckily I had a life time warranty replacement on it and did not have to pay for it. Autozone is definitely going to void that warranty on my next ...
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101 views

How can I get my H.O. alternator to charge at 14.Xv?

I recently installed an Eagle High 250amp H.O. alternator in my 2015 Altima. Immediately upon starting the engine my battery light came on. I hooked up my OBD-II scanner and it shows that the CPU ...
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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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155 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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69 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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2k 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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136 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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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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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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132 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 ...
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1answer
1k 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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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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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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278 views

How likely it is that low alternator voltage cause Xenon HID headlamps ballast to fail?

It seems that the alternator is producing a bit low voltage, about 13.4V max, while this should be over 14V AFAIK, undercharing the battery. The left Xenon HID headlamp ballast failed some time ago, ...
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45 views

20.2 volts on the B+ terminal of a12v alternator.

The engine on my sailboat has an Iskra 12-volt alternator that has worked fine for over 3,000 hours of operation. Just recently, I noticed that the voltmeter shows no charging, ie, only about 12 ...
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2010 Nissan Altima making noise, possible electrical that no one can help with.

Our 2010 Nissan Altima started making strange noises-sounds like knocking under the hood, especially when idling. No one can tell us what it is, when hooked up it doesn't register anything. I have ...
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03 BMW 540I M package Charging System issue

I purchased this vehicle in October 17, 90 thousand original miles 3 different owners according to carfax. Car was in perfect condition, I personally kept in garage and rarely got out for the first ...
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2009 Kia Spectra P0507 code thrown after alternator replaced at the shop

Have a Kia spectra, 2009, and just had the alternator replaced at the shop, it started a little hard and idled a little low off the bat, drove it 25 miles home, idle seemed a bit higher than normal ...
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battery light comes on mazda tribute

2001 Mazda tribute v6 with a NEW alternator. Will start from beginning to be clear. Original alternator went out 3 years ago. Was replaced with after market, this worked for 3 years, was replace ...
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768 views

Car makes rattling sound after shifting gears?

Recently after I got my alternator and battery replaced, I noticed that after a night or two whenever I tried to start my car (after engine turned on), I heard a rattling sound if i started shifting ...
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571 views

2005 nissan altima alternator getting hot

I have a 2005 Nissan Altima 2.5 liter. The first issue is that my belt was vibrateing badly when I would run the air conditioning. I came to find out it was a pulley on the alternator that was bad. ...