Question about 2000 Oldsmobile Alero

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2000 alero battery light comes on especially up hills, but now even at times on flat ground. The battery is new and the alternator did test good under a load test

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  • 11 Answers

Belt Tensioner or the it self belt might be bad

Posted on Nov 12, 2009

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Ive a 2000 alero that have the battery light on the dash.after I put a new starter And battery on it. Alternator tested good. Wont stay charged he power battery.


depends on who you had test the alternator
if the local spares shop did it it may be putting out 14.5v ac not DC as required and this will leave the battery light on and not charge the battery
I always suggest a bench test at an accredited auto electricians shop and if the unit is ok then they have the instruments to find the drain problem

Jun 30, 2015 | Cars & Trucks

2 Answers

The battery is not charging and is bringing up codes P0621 and P0622 indicating a generator field circuit problem. Is this fixable? What do I do?


The alternator is fielded/grounded by the PCM. You need wiring schematics. Check continuity between the alternator and PCM for the field wire. If it is good, the PCM has lost the ground for the alternator(if not, fix or run a new wire). You can fix it two ways. First replace the PCM and have it programmed to the car. This cost money and it will turn the battery light off. Second, is to cut the field wire close( give yourself room to work) to the alternator, add wire to it and ground it to the engine(making sure the engine has a ground strap to the body). This may or may not turn the battery light off. But it will charge the battery.

May 21, 2015 | 2002 Oldsmobile Alero

1 Answer

I have a 2006 dodge Daytona R/T that the dash board will randomly light up and all the electrical will turn off, headlights, radio, AC, heater, and then come back on it does this at random times and can do...


Jennifer,

It would be nice to know what three things they are suggesting as potential solutions, and with little detail to go on I can only give you some ideas, all of which should be tested and verified before doing any repairs.

The problem is most likely a ground or harness connector that is loose or corroded.

I would start by having the battery connections cleaned, test the battery and Alternator, not just a voltage test but a load test for amperage and an alternator diode test.

Bad batteries and alternator diode problems cause a lot of computer related issues including false codes and erratic gauge/light operation, just because a battery starts the car doesn't make it good, its not as simple as that anymore!

Look for grounds near the battery and under the dash near the steering column, anything that is bolted directly to the body, frame or engine block is a ground, with the battery disconnected, loosen and re-tighten any grounds you can find even if they look ok and seem tight, do it anyway, especially the ones near the battery and under the dash.

There can also be problems with the "BUS" that is used for communication between the various modules in the car, causing weird things to happen like what you are experiencing.

Good luck!


Robert Grove, ASE World Class Technician
Orange County Mobile Mechanics 714 709 4594

Mar 10, 2014 | 2006 Dodge Charger

1 Answer

Hi just posted about my alero,the batery light is on and i tested the batery it was 12.5 the abs was checked a while ago and the garage said it was the sensor


CHECK BATTERY VOLTAGE WITH CAR RUNNING.TO SEE IF ALTERNATOR IS CHARGING THE BATTERY. IT SHOULD BE 13.5 VOLTS TO 14.5 VOLTS.IF NOT ITS YOUR ALTERNATOR.IF ALTERNATOR GOOD.MOST TIME IF ABS LIGHT COME ON YOU HAVE A FAULTY WHEEL SENSOR OR ABS RELAY.

Sep 21, 2009 | 1999 Oldsmobile Alero

2 Answers

1992 Buick LaSabre. Alternator apparently quit and no warning from the idiot lights and all of them were not lit even on turning the key to "on". . Once new alternator installed, idiot lights (all of them)...


depending upon where inside the alternator the failure occurred, it may or may not trigger the light, especially if the failure was sudden. That's one of the reasons I like gauges or a gauge&light arrangement better.

Sep 15, 2009 | 1992 Buick LeSabre

3 Answers

My battery light won't go off even though i've had the alternator tested and installed brand new battery


well; on your car, the alternator has an internal regulator. have you checked any wires or harnesses that ran off the battery? And see if you may have a cut place on your cables, or if one has come loose from the ground.

Sep 07, 2009 | 1998 Ford Explorer

1 Answer

2000 alero, started up fine, after about 5 mins on road upon accel it hesitated and felt as if it would turn off. Came to a stop and then upon accel to go., same thing. Went down a hill and upon accel to...


This is a Direct result of a Bad Alternator. You can Run on what is left in the Battery for a Little while and if it sits for a While the Battery will retain enough Power to Start. You may need a New Battery in Addition.

Jan 17, 2009 | 2004 Oldsmobile Alero

1 Answer

Batterie power problem


yes it could be a bad ground. I also would make sure that all connections are tight as well

Aug 30, 2008 | 1989 Honda Accord 4 Door

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