Wiring harness.
This is the work I have done. 4.10 ci. 102 mm turbo. Pro EFI computer, th400. I find the work out if my garage.
Just extend each wire you intend to use by splicing with solder and heatshrink. Make sure the wire you use to extend with, is acoupla gauges larger (lower #) than the ones you're extending.
Its expensive for what it is, but it could save a lot of time and frustration in the long run.
https://www.jegs.com/i/RacePak/806/50KTSWDRAG/10002/-1
Won't save even so much as one second of time if the remainder of your stock harness is still in functional condition.
Extend the wires that feed things you want to preserve, with wire about 2 gauges larger than the ones that are there now.
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See a big red wire? Add a 12' (or 13', or 9'6", or whatever) piece of even bigger red wire. See a medium yellow wire? Add a 12' somewhat more medium piece of yellow wire. See a wire that comes from a fuse that feeds something you're not going to keep working; the pass side powder mirror in the visor for example? Then don't add a wire for that.
Too easy.
Those stand-alone harnesses are great for something like a purpose-built stripped-to-the-bone race car chassis, no interior or lights or anything, where you're only powering certain things that everybody has to power (starter, ignition, alternator, ...) and adds acoupla extra circuits for variable things that some but not all race cars might need (electric fans, nitrous solenoids, ...) but NOTHING ELSE is going to be retained. Not that it's "bad" or anything; just, a question of suitability for purpose. That's not what the OP is doing. For example, he mentions the BCM. Any of those stand-alones support THAT?
The OP seems to simply need to lengthen the wires to his fuse box. Well, some or most of them, anyway. Pretty easy to do that without trying to completely replace the entire car's wiring.









