Spider web Wiring

No, there is no 280Z kit. If you get a generic wiring harness then you'll need to adapt the wire lengths, and forget about finding some of the Yazaki connectors. The AMP connectors are available if you know what you're looking for.

@zmanofwashington may still have the wiring harnesses for a 78. It would be worth asking him.

Unfortunately too many previous owners of S30s "fix" wiring issues with little to no clue about what they are doing.

pilgrim said:

Ain't it true. With almost any used car, I figure the first thing to do is remove any electronic gear installed by the previous owner and return the wiring harness to stock so you know what you are dealing with. The butchery can be impressive.

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Yes, a friend picked up a 77 that I worked on some a couple of weeks back. Someone jury-rigged the wiring in such a way that he cross connected something in the dash with black/white wire. The wire he cross connected usually gets its power from the ignition relay, so when you turn the key off, the relay stays powered up. I narrowed it down to something off the gauge fuse, but I didn't have the chance to dig deeper. Since he doesn't need the fuse plugged in, he has run the car with that fuse out.

Here's a link to wiring diagrams: Wiring Diagrams
The FSM has some nice breakouts of a lot of the different systems in the BE section, too.

As someone who has to work with a variety of wiring diagrams, I have to disagree. The wiring diagrams aren't that difficult to read, nor are the switch layouts.
While Vintage Connections has some of the connectors for a 77, they don't have many that are needed if you're doing a complete re-wire.

I do agree that there are wiring diagram discrepancies. I have been helping someone with rebuilding a 73 wiring harness. It's not surprising since those drawings were probably maintained on vellum in that timeframe, and it is a challenge to keep up with all of the design changes. I know the latter issue first hand trying to update as-built drawings when the field engineers don't provide complete documentation.

I also agree that it won't be cheap, but few worthwhile things are.