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21. Here, an OEM wiring harness is shown as it’s being trimmed down for this conversion. An uncut OEM harness can be modified by HRR. They will trim down the harness and make it a simple and easy-to-hook-up harness. If no harness is available, Retro LSX sells the full line of Painless Performance harnesses. It’s very critical to properly ground the engine, frame and electrical systems. Make sure all grounds are on a clean metal surface. We first ran power and ground to the starter. The clip for the crank sensor is also located behind the starter and should be clipped before the starter goes on.