Please fill out the following to ask a question. 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?