I am finally converting my 75 EFI to SUs. I needed some help in determining which electronic components I should disconnect around the area circled in red below. (See attach.). There are various electrical pieces attached to the black box including the voltage regulator. I know I need the voltage regulator, but what about the rest. Can I just unplug the rest and put electrical tape over the open circuits? Do I need the fusible links as well?

That is not my car by the way. I wish it was.

You'll need all of the stuff in the circles. The vacuum bottle and solenoids are for the air conditioning system, and even though one of the fusible links is tied to the efi relay, it's also tied to the ignition relay and the others are for the ignition switch, headlights, and alternator.

sblake01, Thank You. Oh man! , I was really hoping I could take those off to clean up my engine bay but I guess I cannot go without headlights and all. Thanks again and Happy New Year.

You can, however, relocate to your own liking. I'm doing something similar to the 260Z during the rebuild this winter. I'm turning my heater controls back into 240Z styles to lose the white vaccum bottle, relocating the fusable binks to the firewall and using a gold plated solid brass fuseholder/distribution block in its place.

The A/C is already out and the relay and associated parts are being removed and or bypassed. And the whole engine harness is being reworked to remove un-needed wires and connectors.

Zs-ondabrain, that is also a good idea. I think I am going to revisit my wiring diagram to see what I can relocate. I don't plan on going with EFI any longer..

I Have a FULL Diagram for the 260Z GIF but it's way too big for me to post here. If you email me at wolfin32z@yahoo.com I'll send it directly to you. I got it from a guy a HybridZ. I went thru the entire thing and straightened every single line and item on the diagram.

The first Original is 6913 X 2670 and the reworked diagram is Half that at 3456 X 1335. Way to big to post here. I took it to the local print shop and the gal there printed it into the four sections on 2 foot by 3 foot pages. So in total, the larger diagram prints out at 8 feet long by 3 feet tall.

Once again, this is for a 260Z but most of it should work for an early 75' 280Z. But here's a PDF of a 75' 280Z that should get you going.....

Dave.

75 280Z wiring diagram.pdf

His car is likely a late 75 since it has two fusible link boxes rather than one.

By the way, here's some crapy pics of the printed version, layed out on the bed. You can see the daily items to use for reference.

Dave.

heheh Zs-ondabrain. I like your layout of the wiring diagram. I actually printed up the 75 diagram on 4 legal size paper. I Thank You though for supplying me the attachements above. It is appreciated.