Truck was driving along great(85 Efi, flat bed), parked to grab lunch, tried to leave and there is zero electrical power. No lights, no starter, nothing. i went through the easys. The battery has 12.86.The terminals look fine, no burnt out fuses. i had an extra Efi resistor(passenger fenderwell) and that made no difference.I thought maybe a circuit opening relay or main relay, but wouldnt the headlights still work?

Thank you in advance.

 

Might check voltage along the main battery (power and ground) cables and to the fuse boxes. Probably a bad connection in there and don't just look at the connection. Take it apart, clean the connection and check the wires for corrosion under the insulation.