Question about 1990 Volvo 760

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Start up self diagnostic problems.

I have a 1990 Volvo 760 Turbo sedan. I have read that when the key is turned on to start the vehicle, all the "idiot" lights on the dash are supposed to light up for a bulb check and self diagnostics. Frequently when the key is turned on, only the check engine, low oil pressure, ABS and SRS lights will illuminate, and all but the ABS light will go out when the car is started. When this happens, the alternator does not charge the battery. When I rev the engine to 2500 RPMs or greater the ABS light will go out and the alternator will start charging to about 13.8 volts, but not the 14+ volts it puts out when it is started after illuminating all of the dash lights. What is causing this to happen?

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Maybe a little corrosion on the connection from your alt? it could cause the higher resistance to make the voltage drop. the higher rpm's increase flow of electricity forcing it through the corrosion... maybe???

Posted on Sep 22, 2008


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