Get a DVM, get wiring schematics of the truck and start testing each circuit until you find the circuit(s) that are bad. Or take it to the dealer or trusted mechanic and have them put a breakout box on the system to find the problem.
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Get a DVM, get wiring schematics of the truck and start testing each circuit until you find the circuit(s) that are bad. Or take it to the dealer or trusted mechanic and have them put a breakout box on the system to find the problem.