This happened to me in my Blazer and I never did figure it out I do think that C.C. is right clean off the contacts first thing they may be dirty.
I did had the intermittent wipers also, I think the switches could possibly be bad.
Good luck....
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74 C-20 LWB
camper special
stock350/350
53 Chevy 1/2 ton- in California, where the rust is not. Ready for some LOVE!!!
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