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Wipers will not work on chevy colorado

My husband was haveing to have his truck jumped morning and evening mechanic said it wasn,t a bad battery but changing fuses or swiches wasn,t working. We bought a new battery a day latter wipers don,t work. mechanic buys a used motor, motor works in test colorado but doesn,t work in my husbands truck mechanic is a little stumped. does anyone have a clue?

Try it with a jumper cable from some metal on the engine to some bolt on the fender or firewall. There is a bad / missing ground.