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Installing the Tekonsha # 119190KIT Wiring Harness on a 2017 Mercedes-Benz GLC 300 4WD


Hi I am trying to figure out which wiring harness to use for installing a trailer hitch for my 2017 Mercedes GLC 300 4WD. We have been trying to use 119190KIT but without luck. The turn signal and braking lights will just not work properly. We have been on the phone with the techs from Tekonsha for over a hour and still couldnt figure out why. Any idea? Thanks!


Helpful Expert Reply:

The tail light wiring on your 2017 Mercedes GLC 300 4WD is separate which means that it is a 3-wire system with the brake and turn signals being sent on different wires. For trailers they have the brake and turn signals run on the same wire.

To properly install the Tekonsha # 119190KIT you will connect the following wires from the ModuLite to the following functions on your GLC 300:

Yellow - Left Turn
Green - Right Turn
Brown - Tail/Running Lights
Red - Brake Lights
White - Ground

If you are not installing it this way then that is what is going on. If you are installing it correctly, if you could let me know what specifically is happening with your lighting I can help you troubleshoot further.

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helpful expert reply by:
Jon G

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