I've been doing a lot of custom chassis harnesses lately, but have come back to doing more OEM-style tuck-and-loom jobs on high-end cars that want to retain all their factory systems. By far the hardest system to keep is HVAC, just because there are so many different units (blower motor, mix door, etc, etc) and control is very decentralized... you end up not cutting anything out and having to re-wire the whole thing into your new chassis harness.
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Originally Posted by T chop
I have an S13, Silvia headlights, no heater etc.
I can get rid of both relay boxes,both OEM fuse panels and replace it with about a 12-18 Fuse box? How many relays would I need?
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With Silvia headlights you lose the headlight up/down nonsense and the S13 doesn't have a headlight relay (power for the headlights goes through the switch). Losing HVAC saves a ton of headache. You'll still want an ignition relay to power your coil/coilpacks and ECU/sensors, fan relay(s) to kick on your electric fan(s), a fuel pump relay to handle the fuel pump, and your ignition switch with a big fuse on it to handle accessories. This is all assuming the most basic harness, and it gets complicated very quickly.
Like I tell everyone, no matter what car - if you read the FSM and can't instantly be comfortable with the wiring schematics, you will have a very difficult time at best, and create a nightmare that will never work at worst.