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      I have a '15 2500hd 4wd crew cab long bed with approximately 80k on it. For a while when I towed a trailer, I received the message to check the trailer wiring. After a while it went from check trailer wiring to almost every message displayable in the cluster was coming on, chimes came on repeatedly, lamps allover the inside of the cab were flashing like a strobe lamp anytime you put your foot down on the brake pedal. The power windows stopped working, and door locks stopped functioning. I checked fuses, primary ground cables around the battery, and replaced the trailer brake control module. Nothing has helped. Any idea what to check next?

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