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Is it running or just sitting overnight? Remote started? Is it cold when it happens or just always in the rain? Any other problems? Slow crank? Battery seem low? A little more info..
No matter what, used or not, truck has a 3 year 36k warranty. Bring it to your closest gm dealer and the can not/will not refuse to work on it since its warranty work. I wouldnt touch anything until dealer looks. By chance, when pulling fuses, notice anything wet or wetness inside cabin? Especially on driver side? Does it have a sunroof?
Dont mean to rain on your parade but whoever you bought it from, dealer or private party prob recieved it on a trade and never told the dealer about it or the dealer knew full well and didn’t disclose...i would not go to original place, go to closest dealer to you explain what the problem is, do not tell them you pulled fuses and let them figure it out. Tell them exactly what happens and when and leave it at that, do not offer solutions or tell them any more. Explain that its too far to bring it to where you purchased and any help would be appreciated. You catch more flies with honey... as the saying goes... until they start giving you crap... then you can do whatever it takes. My opinion..
Sounds like a plan. We've got an appointment lined up w local dealer in the morning. Will keep my mouth shut and smile. Thx! ;-)