In the middle of an engine swap in my 77 (ish) and noticing the wiring harness isn't in great shape neither in the engine bay nor under the dash. What are my options for replacement harness without replacing EVERY wire in the car? I'm not ripping out the interior so don't particularly want to rerun the wires to the rear, etc. I'd really just like to replace everything under the dash and of course going through firewall into the engine bay. I've never replaced a harness before so how does one decide how many circuits are needed? I have: Carb engine Electric fans 3g alternator AC compressor Factory AC controls Few gauges inside Stereo Thanks!
Seems like what your looking to do, is add a fuse panel w/ switched/unswitched circuits. One of the aftermarket panel mfg./vendors can supply a panel.
This might be something you want to look at. Since your not looking at doing a complete wiring job. I have 2 aux. panels in my car; I would have used this type setup if I knew about it when I added aux circuits. https://kwikwire.com/collections/accessory-wiring/products/7-circuit-auxiliary-fuse-block
