Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am attaching wiring diagrams for the 1975 chevy truck to help you verify if the wirings your seeing are the problem. As for parts Lmc trucks is a good online vender for parts for these older trucks. If the turn signal switch is the problem then the steering wheel will have to be removed and the signal switch replaced. There are several special tolls required to disassemble the steering column.