The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

LS short box · 02-14-2023, 10:38 PM

My .02 is take the refund/rebate money and buy a aftermarket harness from one of the respected suppliers. I haven't done a LT1. I have done or helped with at least a dozen LS swaps. All had the harness and ECM/TCM supplied by the aftermarket harness builder.
You could send your ECM/TCM to your selected harness supplier and they can delete stuff as needed. Add stuff as needed. And add base tune that will get you to chassis dyno.
I can only guess that a stock C7 engine/trans wiring harness has many many wires you don't need.

02-14-2023, 10:38 PM	#3
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,953	Re: Junk yard motor LT1 My .02 is take the refund/rebate money and buy a aftermarket harness from one of the respected suppliers. I haven't done a LT1. I have done or helped with at least a dozen LS swaps. All had the harness and ECM/TCM supplied by the aftermarket harness builder. You could send your ECM/TCM to your selected harness supplier and they can delete stuff as needed. Add stuff as needed. And add base tune that will get you to chassis dyno. I can only guess that a stock C7 engine/trans wiring harness has many many wires you don't need.