[Joe Wicked]

It has got to be a connection issue somewhere or something is pulling a large load intermittently. If you see it again, start feeling around for a hot wire. If so you may have an intermittent partial short. Hot wire will at least tell you what circuit. You could also look for damaged insulation on the wires. That can create a partial short that will load down the system. Certain types of connectors can also cause similar issues just because of the loading they cause. Miles had an issue with his battery connector causing the fuel pump fuses to blow.