Lost all electical, then is came back? Options

[blitZ]

I did a search for this scenario and didn't find anything.

So, I'm driving home from work. Sitting at an intersection, the car goes dead, absolutely no electrical power. Would not start, no radio, nothing. I pulled the emergency flasher to warn traffic I was down, nothing, great. I start to get out of the car, the flasher starts. I jump back in the car starts right up. I drove for a few more miles and it happened again, while moving. I coast to a side street out of the way, car starts right back up.

It's a 76, any ideas??

[blitZ]

I just checked the battery connections, they are fine, I just installed a new battery recently. However, the battery ground cable was lying directly on the positive terminal. The insulation is intact, just wondering if there could be electron leaking causing a short (it's a stretch, I know). I moved the cable.

Anything else to check?