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Electrical Issue on 1993 Chevrolet 1500 Pickup

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My headlights high/low beams work, the turn signals on the front work as do the running lights. Nothing works in the rear of the truck. I checked all the fuses and there are no blown fuses. I'm thinkin t my be a relay. How do I check the relay?
(3) Answers
It could be your head light switch. Sometimes the head light switch loses a 'leg' which is a branch to the rear of the truck. Do the Brake Lights work?
there is a plug under cab linking to the bed, its there incase you need to remove the bed, fine that plug and check conections there, they sometines get coroded and dirty, hope this helps