I am planning on rewiring my whole car as I am switching over to Holley sniper efi and would like to remove as much wiring as I can and reroute the wiring to make things alot cleaner.
Will also be moving battery to the trunk and making a custom fuse panel.
Has anyone already done this or does anyone have any tips or information on doing this?
Having the wiring diragrams is essential.
On my latest project car, I redid the entire wiring for an EV. However, this car is 10yrs older and despite being a more advanced car than the tbird (Ferrari), it was still simpler wiring job.
- I stripped out all the ICE related circuitry, removed the unnecessary "check control computer" (fancy 80's speak for a panel that shows you when some light bulbs burn out), and rerouted the stock wiring from the fuse panel straight back to the new LED lights, for example.
- The result was a simpler harness built from the stock wires
- The trickiest thing to handle was that some circuits (ex: the horn) were ground triggered wires and the pop up headlight control didn't use limit switches but 3 relays. I ended up wiring in a seperater multi-relay PCB in a weatherproof box to handle these signal conversions.
-I also rewrapped everything with TechFlex which made the install look cleaner.
- My concern was that my fuse panel was very, very expensive, prone to burning out, and used lots of very old components (bosch relays that predate my birth and no longer available easily at autozone/etc). In the end, my new fuse panel cost $260 and I sold the original panel to some purist for $1800. Pure silliness but a win-win for both of us.
In comparison, my tbird is a track car. I kept some circuits (like the ABS power) but stripped down every unnecessary wire inside the cabin as a way to remove weight (ex: no more speaker wiring, wiring to the dome light, etc.).
- I just cut back every unnecessary circuit and wire at the farthest connector I could trace it back to upstream (ex: at the firewall).
- I also simplified the engine harness so it would easily come apart for engine replacement at one place and added a few additional wires that I needed (aftermarket temp sensors).
Sure, you could replace this wiring but I'm not sure anything you install will be "better" than either cutting out the unnecessary wires from the stock harness or just leaving the vestigial wiring in place.
- In your situation, at most I'd strip out unnneeded wiring and then add what few wires you need to go from the new ECU to the EFI/intake manifold/TB
- The stock wiring itself in the tbird is fairly well segmented: there's the wiring to run stuff on the chassis and there's the engine harness/wiring to the ECU. Very few wires go from the engine to other places (say a few sensors and a signal from the gauge cluster to tell the alternator to charge, IIRC).
