Question about 2000 Oldsmobile Alero

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2000 alero Has a charging problem new alternator runs fine for a couple of hours then battery goes dead but the alt puts out 14.6 volts but the batt goes dead

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  • tshea59075 Jul 20, 2009

    I have been messing with cars for thirty years . the car has a brand new battery new alternator puts out 14.6 volts but the batt goes dead after a couple of hours of driving is it the pcm or ecm ?

  • tshea59075 Jul 20, 2009

    my alero is not recharging the batt after the car has been running with a fresh batt you can drive for a 3 or 4 hours . it has a new batt a new alternator new starter all from napa the good stuff there is three wires coming off the alt orange, gray, and red the orange is hot all the time even with the key off the red and gray are the comand wires that tell the alt to charge the batt . could the powertrain control module known as the pcm be bad. no way to check it

  • tshea59075 Jul 20, 2009

    the batterty is brand new the alternator is brand new

  • tshea59075 Jul 20, 2009

    I don't think u understand my problem . The car has a brand new battery a new alternator the car will start and run u can drive it acouple of hours then the battery light comes on the gages go crazy then the car goes dead COULD THE POWERTRAIN CONTROL MODULE be BAD ?

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Hi...

If the alternator giving out a power of 14+ then the alternator is fine.
It seen the air condition or something is sucking power from the battery instead of the alternator.
Could be a short circute too.
See the best way to get it checked is to get the car computer tested.
That will tell you where exactly the problem lies.

Do let me know.

Thanks and Rate the Answer
Smith

Posted on Jul 20, 2009

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It sounds like the battery is not taking charge. Have you tested the battery? If the battery is good, check the wiring going from the alt over to the battery and the lug at the battery post. Give it a 'tug test' and see if it's tight in the lug. It really sounds like the battery is bad. Checker and the auto stores will test it free,(so you'll buy a new one)

Posted on Jul 20, 2009

  • Craig Butler
    Craig Butler Jul 20, 2009

    The wire going over to the post good? Is there actually 14.5 volts on the posts when it's running?

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Is it possible that you hooked up some of the wires on the alternator reversed (probably not unless you may have had to rewire it). An alternator has to be "exited" meaning that you need to put a little power in to it to get alot of power back out of it which I believe you would know. If one of the wires you hooked to it was a "constant hot" (on all the time) and not a "keyed hot" (on with the key) the alternator itself can drain the battery.

If you are sure this could not be it, then you're going to need to put a multimeter on the battery and pull and replace one fuse at a time until you find the drain. (It will stop drawing when you pull the right fuse) Be careful because the clock/radio is a constant drain but a very small one. Save that fuse for the very last.
Let me know what you find when doing this.


Benjamin

Posted on Jul 20, 2009

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The most likely problem is a loose, damaged, or corroded battery connection. Check both terminals and see if this fixes you up.

Posted on Jul 20, 2009

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