What Gauge Wire is Used for Tekonsha ZCI Trailer Wiring Harness to Connect to the Vehicle Battery?

Updated 05/08/2020 | Published 04/18/2019

Question:

What gauge wire does this kit use to connect the controller to my 12v Battery?

asked by: Ralph

Expert Reply:

The ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT uses 12 gauge wire to connect to your 12V battery. It is 20 feet long.

expert reply by: Jason S

James A.

5/6/2020

I have installed the ZCI trailer wiring kit on my tesla Model 3. Follow all instructions. However, running lights on trailer on all the time, even when the car is off. And when the brake pedal is depressed the tail lights on the trailer go out! I've tried disconnecting the tail light sensor and reinstalling via the computer, and the problem continues. Not sure what to try next. Will you help?

Chris R.

5/8/2020

We've seen this happen before and a lot of times it occurs because the magnetic sensors are installed in the wrong direction. Try pulling the fuse on the harness to cut off power and then reverse the orientation of the running light sensors. If this doesn't resolve the issue please let me know.