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Old 10-21-2018, 03:13 PM   #1
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2002 25' Safari
Fountain Inn , South Carolina
Join Date: Sep 2011
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"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.
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Old 10-21-2018, 03:30 PM   #2
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2000 25' Safari
Denver , North Carolina
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Thank You for the details of your issue. I just went through a similar troubleshooting issue. My problem was a break in my TV to Trailer cord. Very frustrating to diagnose too. Those smart alerts can be a little tricky.
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Old 10-21-2018, 04:47 PM   #3
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Thanks for the info. That will help lots of people overtime I’m sure.
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