The original wiring runs a main feed from the starter battery post, up to the headlight switch. There is a circuit breaker in the headlight switch that protects everything else in the truck, as you describe. The horn is an exception. Therefore a blown headlight switch circiut breaker will give you these symptoms.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!