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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 ...

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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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1995 Chevrolet Silverado Z71 alternator not charging battery

I have a 95 Chevy z71 with a 305 in it instead of a 350, I put a new alternator on it and still my battery won't charge and my truck will only crank if its boosted off but as soon as the jumper cables ...
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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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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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LiFePO4 Battery Shutting off When Charging at Low RPM with Alternator

I have a friend that changed out his older flooded lead acid battery for a new LiFePO4 style battery. Ever since his car will die at low rpm with the new battery but when he puts the flooded lead acid ...
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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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26 views

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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Could my mechanic ruined my battery and alternator unknowingly?

My 2005 PT Crusier was working fine with one exception. When I took it to an automotive shop to get an estimate, I told them that it was having a hard time changing gears from first to second. After a ...
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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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34 views

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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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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'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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Would 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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52 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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24 views

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 ...
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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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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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Can a new AC kill the alternator and the battery?

11 days after Sierra Shell mechanics repaired my trucks AC system, truck displays warning symbols on dash and suddenly loses all power. My neighbor looked at battery and adds water to 2 dried cells. ...
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Car chugs along after jump start but no lights work

Today I was leaving work and my car didn't start so I had it jumped by a coworker. I was driving on and noticed that my gauges weren't working and my lights weren't turning on. It also chugs along and ...
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Car starting hack works - but is it an issue with car battery, starter or alternator?

I recently noticed that my car had the issue starting without giving it a boost. It has original battery and has 155k on it. Over the course of 2 weeks I realized below two things which helps car ...
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Alternator on a boat generating 90Amps for three batteries ACR system

After several hours of thorough research, I still haven't found a satisfying solution to my problem. My electrician bought a 90 amp alternator for my boat and I count on charging three batteries ...
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I have a 2015 Kia Forte I have put two Alternators on it within the last 2 weeks why do they keep failing?

Alternator failure: have put two Alternators on within the last 2 weeks second one just failed again what seems to be the problem dealerships it has to be something other than that alternator do you ...
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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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80 views

Ford not starting on key turn after acc

I've got a mk3 Mondeo 1.8petrol zetec. It had bad alternator so I left it laying up for 6 months until I got around to getting a new one, but 3 weeks ago with the bad alternator in it, I started car ...
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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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Aftermarket stereo with alternator whine

I replaced the OEM stereo unit in my 2001 Toyota Celica with an aftermarket one to have bluetooth, USB connectivity, etc. No new wires were added, I just used the original wiring with an adaptor like ...
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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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How can I confirm a faulty alternator or regulator with only a basic digital multimeter at hand?

Make: Maruti Suzuki Model: 800 hatchback Engine: F8B MPFI Battery: Exide 35AH 2.5 year old Rated OCV 12.92 Location: Nagpur, India. Daytime Temp about 44C Background: Around November/December ...
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power inverter to run a shop vac. Could alternator be damaged by this?

I have a standard 200 watt power inverter which I have used to power a sound system off of my Econoline e250 on multiple occasions with no problem. I tried to run a 4hp rigid shop vac off of it and ...
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Cable run to rear truck bumper

I'm trying to install an Anderson Powerpole connector on the back of my truck. Ideally I'd like to go with the Anderson SB50 (rated to 50A) as it is widely used and compatible with various accessories ...
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Battery stops getting charged after 15-20 minutes of driving

I've got a 1998 Mitsubishi L200 pickup that has a charging problem. When I start the engine the indicator shows that battery is charging but after driving for 15 or 20 minutes it stops charging. I've ...
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44 views

1992 Nissan 2.0 (SR20DE), ABS and battery light came on while cruising

Today I was driving on the highway and all of the sudden, the enige surged a little and the ABS and battery light came on. I've stopped the engine and started it again, the engine starts easily. I ...
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598 views

Preventing alternator draining car battery

Just purchased 12V alternator to put on my '26 model T ford. Instructions said without wiring through switch the alternator will slowly discharge the battery when not running. Never encountered this ...
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2006 Vauxhall zafira 1.6 life mpv petrol

How much to replace piston ring on Vauxhall zafira 1.6 petrol sometime loss power up hill cos to bad piston ring car burning oil ?
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56 views

Building E-Bike Help

I am building an e-bike using an electric skill-saw, a car alternator, and a 20Ah battery. I have a few questions because I am new to this stuff. Should I have the motor in between the wheel and the ...
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62 views

How much accurate car cigarette lighter port is?

My car's generator is putting out 13.5 voltages when on full load (blower, ac, lights etc) but when i check the voltage on car's cigarette lighter port it it drops to even 11.6 when blower is on, when ...
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Alternator Replaced in June and March, Today the Car Stops Idler Pulley breaks off. Is this a result?

I had my Alternator Replaced in June, then again March 20th due to an initial defective alternator. I drove 1300 miles since this was replaced and today the car starts shutting off and the power ...
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54 views

Determining Expected Battery Voltage With Vehicle Running

To my understanding, a simple first-step for testing the alternator and related components on a vehicle is to monitor the voltage (using a multi-meter) at the battery while the vehicle is running. ...
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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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2005 f350 wont run after replacing alternator

just replaced battery, alternator and truck drove for three miles before it died. Had this issue before and was able to fix by cleaning throttle body of carbon. tried that again but cant keep truck ...
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379 views

Car turned off in stop light, battery light, oil, and brake light came on?

The situation all started when my nissan sentra 2007 leaked all the coolant from a pipe down below. I couldnt find the pipe in junkyard or in any autorepair shop so i was advised to just run another ...
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41 views

Battery or alternater went bad [duplicate]

Is it true if I take the cord off the negitve side of battery n it dies, dose that mean my alternater is bad
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18 views

Is ir the starter?

I have a 2003 Chevy Malibu and I’m having issue when I try to start it. It doent turn over as a matter of fact, I attempt to turn it over and as I’m turning the ignition and giving it gas, it ...