I have twogm 1500s,they both have the same problem your talking about. The best solution is to locate the wiper motor and check,clean and or replace electric connection. You can purchase the replacement part at your local dealership. You can also have someone turn wipers on after finding the wire harness and give it a juggle. It may surprise you at first. If all else fails after you checked, cleaned and or replaced wire harness its most likely to be the wiper motor. You can purchase those not thru your dealer!!!!! Local parts house carry them or will order them for you. Hoped i ve helped,good luck. I love my g.m.c. Trucks.
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