Question about 2000 Oldsmobile Silhouette

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Silhouette will not start, but battery put out 12+ volts

I replaced the battery and three days later went to start the van and everything was DEAD. I got it jumped and it started hard but was fine. The clock read 12:00 but everything else was fine. I then cleaned the battery cables and checked the new battery which was putting out 12 v. I cleaned connection and put the battery connections back on. The van started hard, I turned the key and it was trying to start for about 10 seconds before it finally turned over. I cannot afford a new van this one only has 106,000 miles on it. It weird the batterys fine but everything is DEAD. Could it be the security system or the alternator?

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You better have the alterntor checked, you said the battery was putting out 12v. was that with the car running or off? If it was running, it should have pushing between 14 and 15 volts, if it wasn't with it running, replace alternator.

Posted on Jan 30, 2009

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Hi

Yes it sounds like the alternator voltage regulator is wearing down and needs to be changed or replaced.

If you can get your hands on a 12 volt multimeter, turn the setting to 20 dc and place the negative wire on the negative battery post and the positive wire on the positive battery post.


The battery with motor off should be 12.6 volts and higher, start the the car the read out should be 14.,2 or higher.


You can turn the lights and heater on to see if the alternator can cope with the load.


if read out is less then you need to change or replace it.

Cheers

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Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

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12 volt is actually a misnomer of sorts... it's actually closer to 13.8 volts i believe. if the voltage regulator is not working right you could very well be frying the battery. replacing it is the cost of the alternator + labour (unless you do it yourself).

Robert

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