I'm sure this info is buried in dozens of topics over the years, but I'm wondering is anyone has a list of all the items that become "hot" when the ignition is ON. I'm particularly interested in wires already within the engine bay so I don't have to run yet another wire through a new hole in the firewall.

I'm pretty good at reading wiring diagrams but figuring out this info from my 1972 FSM or the laminated, color diagram I've gotten from www.classiccarwiring.com is quite another matter.

@SteveJ

Thanks a million, SteveJ. You've saved me hours of trying to track things down in various wiring harnesses. Now, I can just tap into the FLASHER wire coming out of the fuse box and activate the relays for the AC controls, the AC trinary switch (in the engine bay) and the two DRLs (Daytime Running Lights). I'll probably modify things to use the fog lamp wires to reach the DRLs.

But, my goodness, there are a LOT of connectors coming out of the dash. I'm glad I have another '72 that's still together to use as a guide when my eyes get crossed trying to decipher the FSM wiring diagram.

Does anyone have an idea of the location of that inline fuse for the electric fuel pump? I added a NISMO pump and it's hooked up to the appropriate wires on the rear of the body harness but I'd be well served to know where that fuse is... just in case.

If you are looking for a wire out in the engine bay that goes hot only when the ignition is ON, I think your only* choice is the B/W wire going to the voltage regulator.

*There is also the same B/W wire going to the coil (+) side, but I'm thinking it would be better to keep your connection away from the ignition system if possible.