"Check Trailer Wiring" Chevy Story
I started getting "Check Trailer Wiring" alarm in on the DIC of my 2015 Silverado 2500HD. The alarm would come in and clear quickly. Over the course of a few weeks I started going through all the wiring. I replaced the trailer umbilical cord on my 2002 Safari, I checked all the connections on the main panel in the trailer, I checked all the brake wiring, and I check the truck plug. The alarm still continued to come in. ????
Then on a recent trip to a campground with no electricity I noticed that the battery power on the trailer was not lasting very long. I have two good sized agm batteries on the trailer. Doing some searching, I found a poor connection on a fusible link on the positive wire to one of the batteries. The connection to the battery was such that is was probably making & breaking before it completely broke. I made a permanent fix for the bad connection. Now after a few hundred miles there are no more "Check Trailer Wiring" alarms. Before I would have had an alarm at least 3-4 times and hour while traveling.
I believe the poor connection to one battery was causing a voltage sag and spike which was causing the "Check Trailer Wiring" alarm to come in on my truck. Moral of the story is I should have checked the battery cables more carefully. I did a whole lot of difficult checking and replacing when the fix was an easy one. I hope my experience will help another camper some day.