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Do you have a 75 wiring diagram? If you can determine where those wires go it will be easy to figure out what it is...may even been on the diagram.
after some contemplation; I pulled out an ignition kill switch, part of an aftermarket alarm, the relay looked identical to that...but you really need the wiring diagram.
Last edited by wer2xu; Jul 18, 2019 at 09:43 AM.
Reason: more info