2015 GMC Sierra 3500 - Check Trailer Wiring
We just purchased a 2015 GMC Sierra DRW with the Duramax and integrated brake controller. I hooked up the trailer (a 2013 Lifestyle 36FW with the standard electric brakes) for the first time and I dro...
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I had this happen a couple weeks ago and it ended being the main ground wire on the trailer frame. I was getting "trailer connected" "trailer disconnected". Should be a white wire coming out of the trailer side harness. I grabbed it to see if it was loose and it fell off in my hand. I've towed since then and all is good. Something to check. I looked it up before I checked it and it's pretty common.
