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Re: Where to buy best wiring harness for 63 c10
Just went through this, 5.3 swap with th400 and classic update kit. I don’t think there is a package chassis and ecm harness deal. The engine harness blends into the chassis harness easily, it’s usually a two or three wire interface to power the ecm, fuel pump, etc. if I had to do it again I think a cheaper/simpler harness would work just as well unless you plan on power seats, Windows, ac, etc
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