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
190 views

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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119 views

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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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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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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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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142 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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101 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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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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Should a 2004 Mazda 3 run after jumping when battery has a dead cell?

I have a 2004 Mazda 3. It got a new battery just over 2 years ago. About 8 months ago, the alternator died and I had that replaced and everything seemed fine in the months since then, including as ...
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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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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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Car starts with Trickle charger and Battary, can start on a boost but not on battary alone

The battary on a chevrolet cruze is displaying an output of 15 volts and recharges from the alternator. However the car needs assistance from a boost or trickle charger to turn over properly. The car ...
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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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Acura Integra (2000) Electrical Issues

I've been having some strange issues with my '00 RS. I suspect it's the alternator, but having someone confirm would be helpful. There have been two instances of electrical problems: (2 days ago) ...
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Is it possible to replace the diodes in a rectifier?

I've got an alternator whose diodes are going bad as evidenced by excessive AC output from the alternator. The problem is that the diode assembly is a discontinued part, which I can't even order at ...
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62 views

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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86 views

Device that prevents vehicle from draining accessory batteries?

Not exactly sure if the device / component or setup I'm asking about even exists. But, here is my naive question (I am bad with electrical in general): Is there something built into modern vehicle ...
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1answer
3k views

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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479 views

Does low alternator load create more heat?

For example, it seems switching from some high wattage headlights to much lower wattage LED's frees up more of the alternator's power capacity. But, does this mean the alternator (or other electrical ...
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141 views

how to install dual battery in car

i live in Ulaanbaatar the coldest city and i own a hyundai verna 2006 with 1.5 turbo diesel engine. i replaced it's 12 v 80 Ah battery and glow plugs about a 3 month ago. last night we had -40 c and ...
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Is it bad alternator or starter? Camry ‘05 173k miles..

I started my car after two days of cold weather, around 20 F. After heating my engine for about 15 minuets I turned ignition off. After that it does not start, it start to crank but dies off well ...
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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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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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126 views

Is my charging system faulty?

I've a Mazda 323 2005 model. Today while at going to work in the morning the car had starting difficulty. Back getting home in the evening the car struggled to start, upon opening the hood I noticed ...
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779 views

Upgrading a Ford 1G alternator: What is 7074 vs 7078, or is a kit a better approach?

I have a 351W with a Ford 1G 15 volt 55 amp #D20F-10300-EB alternator. I'm looking to upgrade it to 100+ amps. I could go to a 3G, but I don't know whether I would need to change mounting brackets, ...
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295 views

Replacing an alternator on Mercedes B200 CDI - voltage regulation?

My mechanic said, that an alternator on my Mercedes B200 (W245, diesel, 2008, 1993 cc) needs to be replaced (because of red battery sign, that is shown and beeps from time to time). My original ...
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1answer
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Can running a vehicle with a dead alternator solely off a jump battery pack cause damage to the vehicle's battery?

I'm a service employee for a highway assistance program. I came across a vehicle where the alternator had failed, and the vehicle drew all available power from the onboard battery, causing the ...
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Chevrolet Aveo won't start (codes: P0340, P2106, P2110, P2101)

Two months ago my Chevrolet Aveo 2007 had intermittent interior and exterior light flickering problem that was especially noticeable while idling or driving at low speeds. Also, one morning the car ...
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1answer
859 views

2014 Mustang Check Charging System

The light first came on about a month ago, intermittently, every 3/4 days for about 2 weeks. Then it started staying on, alerting me 2/3 times in a 30 min trip. Then 30 mins into a hour drive home, ...
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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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1answer
112 views

Wish to charge battery in caravan from car alternator while travelling

I would like to run the 12 volt capability of my 3-way caravan fridge whilst travelling rather than the gas. If I put a 12 volt battery in the caravan what system do I use to charge this battery from ...
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always takes a few attempts to start the engine (no cranks), even with new battery

it always took me a few attempts to start my sienna 2000 (130k mi). so I have battery replaced (it was about 12.3v). it went well the same day. the next day I failed to start it again (again, no ...
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1answer
282 views

Vehicle alternator voltage/current output's relation with throttle / engine load

I was diagnosing my alternator to find out if it is working properly. It seems like it is doing its job well. Anyway, interesting thing I found out was that the average voltage output from alternator ...
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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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4answers
3k views

Can an alternator be damaged from the shock of a low-speed collision?

I have a 2010 Honda Odyssey that was recently involved in a low-speed front-end collision. My vehicle was stopped at the time and it was struck by another that was accelerating from a stop (so I'm ...
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1answer
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2008 Chevy cobalt starting problems

So the car was having trouble starting for the longest time. Put the key in the ignition turn and get a single click with no start. After a few tries it usually starts right up. Car slowly died while ...
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164 views

charging system/ 1996 Jeep [closed]

I hooked jumpercables backwards. I changed alternater and battery and it is still not charging. What can it be?
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Battery Voltage low when car is running. Should I be concerned?

Car: 2010 Mazda 3 GT 2.5L Manual 160,000KMs I purchased the car 3 months ago not knowing the history of the battery, I wanted to test it. I measured the voltage across my battery using a voltmeter ...
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3answers
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Alternator going bad twice after five months

Hello I have a Chevy Cobalt LS 4 door. The alternator went out in July 2016. It was replaced and went out again in January 2017. It was replaced. Now it is going bad again started in May and finally ...
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5answers
6k views

When running a pump off your car battery, does it matter of the car is running or not?

Are there advantages or disadvantages to having your engine running while running a device (compressor, etc) directly from the battery?
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Starting problems, could it be something other than the battery or alternator in this case?

Vehicle of interest is a 2010 Dodge Charger.  This issue involves a co-worker whom asked me advice a while back on what could be wrong with her car.  The symptoms described an obvious failing ...
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Audi A3 (2001) battery not charging

I left my A3 for an hour after driving it normally, and when I returned I found the battery was almost completely dead. The car wouldn't start, and even the hazard lights were having trouble staying ...
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2answers
407 views

24V truck charging circuit problem

I want to diagnose a faulty charging system in a European coach bus ('99 Neoplan). It has 2x 12V batteries in series and also two alternators. With the engine running I measure ~21V across the end ...
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2answers
98 views

Diagnosing Electrical Problems

I'm just looking for some general advice. Today I was driving at around 80km/h when my battery light came on and the car seemed to lose power. When I went to start it, the engine seemed to start (at ...
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1answer
633 views

What's wrong with diesel on alternator

I have a problem with my peugeot 205 TD from 94. I had a diesel leak from injector return lines. I just fixed that but it seems like my alternator broke, again, it's like the third one in two years ...
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2answers
4k views

Motorcycle Alternator Output Capacity

I want to determine the available capacity of the alternator for adding additional loads. It was suggested, "... that to figure out the actual capacity, get a Big Ass (tm) rheostat and hook it across ...

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