2004 GMC Sierra dash lights go off and on.

Eric1974

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MAKE:GMC Truck
MODEL:Sierra
YEAR:2004
MILES:160000
ENGINE:V6
This truck belongs to a friend. He said when he is driving the dash lights turn on and off randomly. Probably hitting bumps I'm guessing. Was thinking dimer switch maybe? I got the info about a week ago but just have not posted until now but I recently learned that the switch felt a little loose he said so that's kind of why I was thinking it was that even more. Loose wire perhaps?