It sounds like the switch is defective did you use an ACDelco or GM part? If not this will be the problem. The inside circuitry of aftermarket switch are less than desirable or you have the wrong switch option.
Below is a guide to help others get the job done that visit this post.
Please let us know what you find.
Cheers, Ken
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Thursday, January 4th, 2018 AT 2:34 PM