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Look at the circuits and see if they have any common grounds or power sources.
Also since your car is old enough use a test light for checking for voltage. If you have a corroded connection you may read good volts with a meter and still have a bad connection. So load the circuit with the test light to verify it.
Or in simple terms connect your voltmeter and then touch the connection with the test light. If the volt meter still reads 12v or so the connection should be good. If it goes to zero or 1 or 2 volts then you are looking at a bad connection.
Good luck
Chris
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