Re: 5.3 SWAP Wiring Problem
I dont know if this will help you but my swap had the same issue, however when I found one of the W4Me supplied harness power needs was a constant 12v through the key on and start process was lacking, I put one from the fuse box and it started and ran. I used the W4Me harness and sort of stock truck harness along with the fuel pump and fan relays. Hope it helps.
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