I washed the '68 and then went for a little spin. After a few miles, I noticed the dash lights going dim, and then the turn signals wouldn't work. I barely made it home with any juice (9V), but the engine kept running fine with the Accel HEI supercoil ignition set up. Hmmmmm, never done this before.
I have an external regulator alternator. I checked inside the voltage regulator (a few months old), the relay contacts were fine and no fried wires. All the under hood wires are in tact, connected, and running where they are supposed to be. No alternator idiot light indications while the lights were going dim. No smoke, no abnormally hot components. No water from the washing got under the hood.
A couple of spins ago, the alternator light came on when I started it. I revved it a bit, but it didn't turn off. I think twice in the last year the alternator light has glowed faintly on starting, but a rev shut it off. I stopped the engine and restarted and it did not come on again. It has operated flawlessly.
Any ideas on where to start de-bugging this??? Thanks for the help.