Question about 1990 Pontiac Bonneville

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Battery light on

I have a 1990 pontiac bonniville turned on defroster battery light came on

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It is possible that the extra demand placed upon the charging system finally blew the alternator.
You need to have the charging system checked,,or check the output yourself with a volt meter (should be around 14-15 volts) test must be done with the car running.
If the voltage reads up to 14 or 15 volts then it would indicated a short in the dash control circuit.

Posted on Jan 30, 2009

  • Alex M
    Alex M Jan 30, 2009

    Sorry,i should have said if the voltage reads 14 to 15 then your charging system is ok,,and the problem would be in the dash most likely.

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Have the alternator tested, the likely cause is a defective diode in the rectifier, this reduces the output of the alt so when u add the 30 AMP+ load of the defrost grid the alt output falls below battery voltage and turns the light on. Allot of people think an alt either works or doesn't this is far from the truth.

Posted on Jan 30, 2009

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