It looks almost like a starter relay out of an older jeep. I will try and barrow a camera and take pictures of that area. The shock tower in my 78 has nothing on it.

Great news!

I started systematically checking electrical components and cleaning up connections. I started with the fusible links, and although they didn't look too bad, the metal was not shiny. Took some sand paper and a file, cleaned out around the links and put it all back together.

Next day, turned it over and started no problem! No issues with starting cold.

Great when things go your way.

For those 280z owners out there, I did come across an article at the Atlantic Z club that dealt with trouble shooting electrical for fuel injection systems specifically.

Sounds like you have this all figured out. I thought I'd add this. I found two of these exact type of relays mounted to the sidewall in the engine compartment near the coil onmy 240Z. Turns out that these were used as part of a funky alarm system that was toed into the door pin switches and an aaooogaahhh horn. The system was activated by flipping a switch mounted in a secret location. Basically all it did was activate the horn if someone opened the doors, hatch, or the hood. The horn has been removed and the rest will be removed/replaced at a later date including the relays.

Maybe that's what your mistery togggle switch in the other thread is for.