2012 GMC Sierra Electical PROBLEM! HELP!

Asked by Jul 20, 2017 at 08:12 AM about the GMC Sierra C/K 1500

Question type: Maintenance & Repair

My 2012 GMC has an electrical problem and its driving me nuts! I replaced the battery in it in Nov of 16, but around December 2016 it started wigging out on me. First I started to notice the radio and lights will flicker or cut off just a second. Normally when tapping the breaks or brightening my headlights. Then it got progressively worse. Along with the radio and lights diming or cutting off, my door locks would repeatedly lock and unlock, RRM gauge and speedometer would bounce up and down, tranny would shift off and come back in 2nd gear; Stabilock and abs cut on and off. I could pull over and switch the truck off and turn back on and everything clears up and runs fine for while. Here recently, its gotten to the point that if I cut my truck off while its wigging out, it will not turn back on. no juice no power, nothing. Ive been having to disconnect the battery and reconnect to get it to crank again. Anybody got a few ideas or possibilities?

2 Answers

1,720

Immediate thought = ground connection

Kr- that's what I'm really hoping. Not sure where to start looking if the grounds check out.

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