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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73 views

Bad alternator, or just a regular dying battery?

The battery in my car is dead, and I'm not sure whether it's the alternator's fault or just the natural death of an old battery. Vehicle: '04 Honda Accord. The alternator was replaced 4 years ago. As ...
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What is the Likelihood of a car alternator fault being due to worn field winding brushes? [closed]

TL;DR: If a 2001 Toyota Corolla alternator is faulty, how likely it is that the field winding brushes have gone open circuit? It's reasonably likely that the alternator is the original one.  ...
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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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Schematic for Ford IASF Regulator

Where can I find the internal schematic for the common Ford external alternator regulator, the one with I A S F terminals? I believe these type regulators were very common in the '80s. And also the ...
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Jeep won’t start after new alternator

I put in a new alternator in my 94 Jeep Cherokee and charged the battery and now it won’t start. It used to start when we jumped it on the old alternator, but now when I turn the key all I get are my ...
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2007 Mercury Montego V6, Need to test the alternator output independent of the wiring harness and computer

We've had the alternator rebuilt once and replaced it entirely with a brand new one. We've replaced the battery twice. Mechanics keep insisting it's the alternator. And I quote "it's never the ...
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Car Battery Charging Current & Car Battery Confusion

Confusion Regarding Car Battery and Charging Amps What is charging current in Car Battery : If both the battery’s have Ref Capacity - 68, But 1st Battery has a Charging current of 4A and the 2nd ...
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Brand new lead acid car battery reads only 12.33v. Is it faulty?

Yesterday I purchased a brand new, maintenance-free, 12 volt lead acid car battery. Specs: 47Ah and 450CCA. Before I install it in my car, I measured the voltage with a catIII digital multimeter. It ...
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Alternator output power relationship

Overview: I am currently working on a project that requires a 24v alternator, which is powered by a mower engine. This engine in particular runs around 3,000 rpm, give or take, and does not exceed 3,...
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Alternator going out or Power steering…?

Got a 2009 Honda Accord that's been idling a little rough and shuddering/vibrating. When I turn the steering wheel, RPMs quickly jump from 500 - 1100 and then quick drop down and car sputters like it ...
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Alternator squeal

98 rav4. I have a bad squeal, however I tried a new alternator and it did not go away. The charging voltage does not go above 12.3 and when I unplug the plug on the back of the alternator the ...
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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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brushless alternator with external regulator

I'm interested in using a Delco Remy 38si with an external voltage regulator. Obviously, the voltage regulators can be removed on these units, but I'd like to know whether anyone has modified one (or ...
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2011 Ford Mustang Gt “Check Charging System” light after changing alternator

My mustang started showing a code for "camshaft position sensor" so I replaced it. 1 day later, it came back on, same sensor so I started doing research. Everything I read said it was probably the ...
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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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How is alternator directly connected to vehicle electronics?

I've tried a lot of research but I can't find specifically what I'm looking for no one has actually mentioned this and I've looked at various wiring diagrams which still don't prove how this is ...
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Diagnosing alternator or starter on a 16 Chevy Cruze LT

how do you know if it's the battery starter or alternator in a 2016 chevy cruze lt when i started the car it sounded like it wasn't going to start also not sure if it's related but i had to get a jump ...
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Bad alternators?

My elderly neighbor has a 1998 Expedition with an alternator problem as all of the units I've installed and tested output less than 12v. He wants to save some money and purchases used alternators ...
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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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Electrical failure [duplicate]

While fitting a new battery for the old one I erred by placing leads in the reverse order, when I corrected my mistake I found when i try to start the car all switch off for a couple of minutes, when ...
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1999 taho gas engine alternator check

Had alternator checked but my negative terminal is loose would that give a false reading .. it's really loose and says the part is bad yet when I drive the vehicle it stays in the middle like normal ...
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Total Electrical failure Mondeo 1.8tdci 2008

While charging a flat battery all on the Mondeo all of the electrics failed (lights, dash, not starting, Windows, ect) when I installed a new battery on the Mondeo still nothing. Any ideas on what ...
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Can car alternator be used to save fuel by using it as a regenerative system at the same time?

Car alternators are 3 phase DC excited synchronous electric machines. They can be used as a motor by a proper 3 phase motor driver. Let's think that we connected a 200Ah Lithium based (eg. LiFePO4) ...
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Access to alternator output for powering a custom device

I have a custom made circuit (device) to be installed in my vehicle. This device is to work (power up) only when the engine has started. It consumes a reasonable amount of power hence do not want it ...
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Car won't start after sitting for 2 years even with a jump. Is it a starter or alternator issue?

My parents have a 2001 Pontiac Aztek that's been sitting for two years. Apparently, before they stopped using it, there was an oil leak that caused starter problems (they couldn't find the leak), and ...
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faulty alternator problem?

I have a 2002 mitsubishi magna, battery light came on intermittently one day and a few months later the car died mid drive, battery completely dead. i got a jump start which lasted about a minute ...
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New ish battery, new alternator, battery light stays on (dim)

Battery was replaced 7-8 months ago (Interstate batteries brand) Got new alternator today after car died When picked up, battery light was faintly glowing Mechanic said everything was fine and it's ...
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494 views

Car battery voltage always drops even after full charge

I bought a new 2019 Kia Forte last year, from the day I received it, its battery (lead-acid AGM) read a slightly low open voltage of around 12.45V. I figured out the car must have been driven on the ...
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1answer
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Alternator health check

My car (Fiat Grande Punto MY2008) has been having an occassional battery light and failure of the power steering. Perhaps once in every 10-15 startups, and is resolved by restarting the car. The car ...
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315 views

Jump start car - now alternator fail

What are the tell tale signs of connecting a jumper cables the wrong way. Will other sensors blow first? If there is a voltage difference between cars could the alternator blow. I helped jump ...
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1answer
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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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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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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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139 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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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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1answer
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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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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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1answer
64 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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2answers
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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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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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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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48 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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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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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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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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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 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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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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