Troubleshooting Primus IQ Brake Controller Showing No Trailer Connection

Updated 03/16/2018 | Published 03/15/2018

Products Featured in This Question

Tekonsha Primus IQ Trailer Brake Controller - Up to 3 Axles - Proportional

(2158)

$90.04

Dielectric Grease for Electrical Connectors, 2 oz.

(1481)

$10.94

Hook Probe Circuit Tester

(60)

$12.27

Question:

Everything is plugged in correctly. Also everything is brand new. But I get n.c flashing and then just 1 . In the middle. [ . ]

asked by: Gavin

Expert Reply:

The Tekonsha Primus IQ Trailer Brake Controller # TK90160 has the NC flashing and then changes to just the dot because it does not see a trailer connected. This simply means there isn't enough of a draw on the brake controller output wire to show a trailer connection. I've attached the installation details that outline this error.

This often means either the vehicle side trailer connection or the trailer side wiring connection has a weak connection, normally due to corrosion or debris. You can use some sand paper or steel wool on those connectors and then use dielectric grease like # 11755 to keep moisture and debris out of the connections.

To test without a trailer, use an incandescent circuit tester like # PTW2993 on your 5 o'clock pin on your 7-way.

expert reply by: Jason S