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Start by checking the fuses. If those are good, then you move on to the switch, make sure there's power going to the switch, and make sure the switch has continuity when it is engaged. If that checks out, unplug the wiper motor and ensure that power is getting to the wiper motor. If power is getting to it, jump the wiper motor from a power source other than the wiper motor circuit to verify that the fault is in the wiper motor... if it doesn't function at that point, then you need to replace it.

The wiper motors are fairly common... almost certain any of the major auto parts chains can get one, but I'd recommend giving Rock Auto a try first.

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Q: How do you troubleshoot a 1978 Chevy Cheyenne wiper motor and if it's bad where to get one?
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