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When towing my car hauler my truck likes to ding and give me the "Trailer Disconnected" message.  During that time (which usually lasts a few seconds until it says "Trailer Connected") the brakes and lights continue to function as normal.  My other trailer does NOT do this.  My car hauler also does this on a different truck.  That all makes me say that this is the trailer, not the truck.  It's quite maddening to have the truck continually ding at me every couple minutes on a road trip.


That being said, how does the truck "know" the trailer is disconnected or not?  That knowledge will help me trace the issue here.  I suspect it's some sort of grounding situation on the trailer.


Thanks!


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