Yes you have a real puzzle here. We're still finding the clues.
OK
I'm confused on this one. I thought it might have because
OK. That's good. So J2 gets power when the key is in run.
This is seems like another good clue. IIRC the wire to the brake light switch on the pedal is always hot but it is fused. What your '62 may share on that line I'll have to look.
I agree. Probably you heard the relay click.
S2 should only have power when the key is in start. Otherwise it shpould be dead.
R3 would only show system voltage if the key is in run, and the voltage regulator is allowing current directly through it.
