Pull all the fuses one by one and leave them without replacing them until it's found or until all the fuses are pulled.

Does that truck have the OBD I rudimentary computer and sensors? I had a module on an '88 Dodge Dakota do a similar thing.


1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)