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Your issue is most likely being caused by a poor connection at the wiring harness connector, The Female Pins inside the MAIN harness connector are most likely spread/damaged/corroded/dirty. Carefully examine them. MAKE SURE that the metal tongue inside the female pin that makes contact with the male pin has a nice tight grip on the male pin.
Here is an example of a damaged female pin vs a new set of pins:
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
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