Question about 1999 Oldsmobile Alero

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Battery light on ,on my 99 alero,but it doesn;t ,die when all lights and heat on ,could it be the alternator?it runs great otherwise

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It could be the battery is starting to go or it could be the altinator.. It would be advisable to have them both checked..

Posted on Sep 23, 2009

Testimonial: "thanks the batery is fairy new so i think the alternator"

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LOL but that does not mean the alternator is good disconnect the battery while running if it dies it is the alternator .

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Did you have the charging system and battery checked first before you started throwing parts at the car? Because I'm start to think that its in the wiring from the alternator to the battery (if the alternator was tested good). the symptoms are pointing to a bad alternator with the car not running after a jump. (the car is running off the battery which doesn't have much a charge and then it dies when the battery voltage drops too low). I would bet that your ignition wire to the alternator is bad (or signal wire) which tells the alternator the car is on and to start charging. I had a similar issue with my Honda and only a technician who rebuilt alternators was able to show me how to test it. Seems like you have a similar issue. Have the alternator and battery tested at any local Autozone and if they both test good I would start with the wiring as I suspect this is the issue you have. One of your alternator wires is the ignition wire which puts 12volts to the alternator (turning on the charging) to allows it to put out voltage to your battery.

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Have the diode checked out in the alternator. If the diode is weak its going bad and will make the light come on. Also a weak belt tensioner will do just that although your described symptoms does not lead to that
The diode lets the current run one direction to create a DC charge. If the diode gets weak the current will reverse causing an AC charge making the light to go on. A reverse current will not allow the battery to get charged up neither

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COULD BE GROUND PROBLEMS OR THE TACH GOING BAD.EVEN THOUGH CAR SEEMS TO BE RUNNING GOOD IDLING GOOD.SOME TIMES A SPARK PLUG MISFIRE.CAUSING A LITTLE ROUGH IDLING CAUSING TACH NEEDLE TO GO CRAZY.I SEEN ALTERNATOR WITH VOLTAGE REGULATOR GOING BAD CAUSE A POWER SURGE CAUSING HEAD LIGHTS TO DIM A LITTLE THEN BRIGHT WHILE ENGINE IDLING.THIS WILL CAUSE TACH METER NEEDLE BOUNCE AROUND ALSO.

Apr 03, 2010 | 1999 Oldsmobile Alero

1 Answer

99 Alero battery light comes on, but starting


The problem may be your alternator.
Check the alternator 'IND' wire is properly connected.
Check the alternator is charging OK - Battery terminal voltage 14.0 - 14.5V approx when running.

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sounds like you have either a bad alternator or short in the charging system and the battery has proably died

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  • see if you can hear the fuel pump click over when you turn it to start position! this may be a fuel pump?

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1 Answer

Battery not charging


Sounds like the cells in the battery have shorted. It's probably shot. Does the car run once its jump started? Does it continue to run after the cables are removed, if so your alternator is ok and its the battery. Hope that helps.

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