A short could cause your Primus brake controller # TK90160 to think that a trailer is connected. You can check the 7-Way trailer connector at the back of the vehicle and check for any corrosion on the inside, where the wires attach, and outside on the pins. Also check for any loose, damaged, or pinched wires while you are back there.
Another possibility is dirty contacts on the inside of the brake controller. What you can do for this is apply the manual override fully then let it snap... view full answer...
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