Driving down the road, my '81 chev truck lost all electrical power. No
radio, dash lights ... nothing. The battery is recent and has been tested
with a voltage meter and is good. We also tested at the starter, and the
power is getting to the starter. After the starter the wires seem to go to
a rather useless(to me anyway) device that has two connections, on the
firewall beside the brake booster. It looks like a ground. No power
registers on the volt meter( I don't know if it's supposed to, but it seemed
logical to trace the power from the baterry and on from there.)
I don't understand why ALL electrical power throughout the vehicle would
fail. At first thought, it must be a ground, but all other grounds seem
fine. Could it be something as simple as a fuse, or since the age of the
truck, the whole fuse box itself.
If anyone knows of a diagram somewhere on the internet of the '81 engine
bay, I could start with that.
Any advice is appreciated.