ECM/TCM engine, Classic car wiring replacement. What did you do?

[tectactical]

I have my 2019 GM 5.3 LT-680L trans going into my 55 Chevy. I'm finishing up the frame and drive train, and that got me wondering about wiring. Does everyone just get a generic harness and wire up what they need?

Most wiring harnesses are built for wiring up the engine and dash/instruments. With mine, the dash is running off the OBDII port (no instrument wires) the engine is; well ran off the harness, so that is a crap load of wires that would just be trimmed off. It's looking like I'll just get a fuse block for the AC, windows/locks, radio, and lights with a few extra for minor crap.

What ya running and what did you do?

[gtstorey]

Post this in the GM v8 Gen5 section for help. This probably isn’t going to be as simple as you think.

[gtstorey]

Or possibly the gen4 section, I’m not sure on what years the trucks changed.

[tectactical]

I don't need the engine harness, that's taken care of, I need to wire the rest of the entire car so engine or generation wouldn't matter.

[gtstorey]

In that case, on my kit car swap, I used a thinned chassis harness with the stock fuse box and bcm handling the exterior lights and a eBay fuse box plus relays to power other accessories.