[franken]

If I recall, it's a large red wire that comes from the battery. There's a junction bloack on the fender next to the battery that should have a fusible link on the battery side. It goes over the radiator to the connector by the master cylinder.
There's a color wiring diagram on this site that might help...

I'd check if say the horn or dome light don't work when the thing shuts down, since that wire powers everything but the starter motor.