Could be one of the unused alternator wires on the wire harness needs to see battery voltage. Check to see what each alternator wire is used for.
Most if not all North American sold passenger cars including trucks and Japanese imports started using a computer in their cars since 1980 - 81
You would know its your car but i would be amazed if it
did not have a computer.
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Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
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