just for flavor - the stock wiring is not 10AWG.
if you drive headlights, stereo, electric fans, electric fuel pump, amps, etc, you can quickly exceed the amperages of the stock electrical system. If you examine your stock harness around the heater, or headlight connections, for example, you may find a wire looking like this
View attachment 399803
or like this
View attachment 399805
both pictures demonstrate wire failure, and should be replaced.
I recommend doing the ALT <> BATT upgrade, the firewall bypass, the ammeter bypass, and the headlight relays bypass.
try not to die -
- saylor