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Check the charging system first. With the car running use a multimeter to see output of the alternator at the battery. Should be 13.5 + volts if the battery is not at 100% charge. If the guage is right and the voltage drops off check to be sure you have power to the back of the alternator. It's possible you may have a alternator problem or if it's externally regulated(I think it might be) a voltage regulator problem.

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Q: 1986 300zx computer where do i find it i was told it wasmy computer my car won't charge or run the battery gage goes from 14 to 12 then drops to nothin?
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