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Spider web Wiring

411 Views 10 Replies 5 Participants Last post by  OldSchoolZGuy
So I’m a new member to this forum and I just got a 1978 280z not too long ago and the wiring is absolute trash, all diy, fuses everywhere, random wires not even attached to anything, you can imagine. I don’t even know if everything is working properly because I can’t figure it out. I wanted to re-do it all myself and buy a wiring harness online. Only thing is I also wanted to shave the engine bay the most as possible so I wasn’t sure on buying a universal kit. I saw a few people on here got the ez wiring kit as it’s cheap and easy but again wasn’t sure as I saw it’s a universal kit. Would there be either a 280z kit or a universal kit that fits well for relatively cheap? (Under ~$400 preferably)
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Free Factory Service Manual here:

The engine bay EFI wire harness is basically a stand alone and only goes from the ECU to the engine with a connection to the battery via the EFI relays. Study the wire diagram in the FSM and understand what and where before you dive into this undertaking. The better you understand how the EFI system work the better off you will be to tackle any and all of the "projects" that you have taken on in purchasing a Z.
One thing to remember is that red is not always a power wire and black in not always a ground wire in the Z world.
Welcome to the world of ZZZZZZZZZ!
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