Truck bed trailer plug
Hi folks,
So we had our first trip with the new 29.5 BHDS this weekend. It didn’t start off the greatest. We got a couple miles north of our town and my service trailer brake system lights came on in my 2018 Sierra 2500 and I lost the trailer brakes. The trailer was plugged into the Hopkins 7 round plug the RV dealer installed in my truck bed. With the trailer being new, the trailer brakes were not completely adjusted yet. I was using the trailer brake controller in manual to get the brakes to set in. In full disclosure I was riding them pretty hard down the large hill in town. We circled back to our GM dealer in town and I pulled the trailer brake fuse thinking it was that. Swapped it out and no go, light still on and no brakes. The tech came out and ran the scan tool and laptop on it. 5 codes were stored that included short to ground, but the 30 amp trailer brake fuse wasn’t blown. They plugged the trailer into my factory bumper 7 round, cleared the codes and tested the factory trailer plug for function and to verify voltage changed when I changed the gain on the controller. All worked fine so away we went with the trailer plugged into the bumper. We stopped back at home quick so the kids and dog could go potty since a couple hours had passed. I put some dielectric grease on the trailer plug and moved it back to the plug in the bed. We go to leave and as soon as I hit the brakes the service trailer brakes light comes back on and no brakes. I put my scan tool on it and same codes as before. I move the trailer plug back to the factory plug, clear the codes, brakes work again, and off we go. No issues with it all the way to and from campground.
What’s odd is I used the bed plug when I pulled unit home and no issues. It also never blew the 30 amp fuse so I’m not buying the short to ground code. I’m wondering if the aftermarket plug uses smaller wire for the trailer brake line, it got hot, increased resistance, and the trailer module on the truck “thought” there was a short to ground?
Anyone have this happen to them or have any suggestions?
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