not too sure where to find one but it sounds like my 66's wiring harnesses. the dummy that had it before me took some pliers and cut all the wires from the engine, front lights, and rear lights happy he didn't cut the harness that runs from the front to back no one reproduces them cuz of cost. I had to use a tester and guess what goes where, most of it is working now
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Owner of a 66 chevelle malibu.... might be on the road next year. I HOPE!!