Question about 1990 Pontiac Sunbird

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Have a 1990 Pontiac Sunbird.Charging problem,replaced alternator and battery still same problem.Is there a fuseable like wire coming off of the alternator harness somewhere I need to look at.

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If the old alternator had a shorted diode, it would have blown the fuseable link which is located somewhere between the alternator +12 volt terminal and the starter solenoid--it should be hanging out of the wiring harness and look burned if open. Be sure to replace it with the correct part and use crimped '****' splices to reconnect. The battery should show over 13.5 volts when the alternator is providing charge. Hope this helps!

Posted on Jul 19, 2010

Testimonial: "Thanks alot !"

  • fxrsmike Jul 21, 2010

    Thanks for the insight.I'll check the fuseable link wire.I do have a handheld battery and charging system tool and in the begining it said that the diode was bad.No reading at all.

    Thanks again !

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