Troubleshooting Error Code On Tekonsha Primus Brake Controller

Question:

The controller says SH. Checked all trailer wiring and it seems good. However when I ohm the brake wire to the ground wire it reads no resistance when unconnected to the truck. Is that a normal reading? All brakes are working fine when power is applied. 6 wheel braking. Tekonsha Primus brake controller

asked by: Wayne P

Expert Reply:

When S.H flashes on your Tekonsha Primus IQ Brake Controller # TK90160 it means that the brake wire sees short during idle condition or that you are using some test lights or non-Tekonsha testers. Because you say all 6 wheel braking is working fine when power is applied, it could be that you have enough power even with a short to operate your brakes. This could be as basic as a poor ground or you may need to replace the brake control wire to get that code to disappear.

I've attached the installation details that help with this code to assist.

expert reply by: Jason S