When a brake controller like the Primus IQ # TK90160 indicates "n.c." this means something is interrupting the circuit connection between the controller's output (on the blue wire) and the trailer's brake magnets. Lots of things could cause this issue, anything from a bad wiring ground connection at the vehicle or trailer, corrosion on or inside the vehicle or trailer connectors, a bad ground at the brake magnets or simply a damaged or pinched wire.
Since the "n.c." appears on the controller... view full answer...
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