C300fan2

Just completed the install of CURT 56146 Powered trailer wiring into the GLK250 with Led lights.

I needed a fuse tap and some wire to complete the install. I also covered the wire with wire loom just for protection and presentation.

Wiring is as follows:

CURT UNIT --------------------------------------------------MERCEDES

WHITE AND RED (ground) ---------------------------- Vehicle chassis ground
BLACK (12v power)-----------------------------------------FUSE TAP AND FUSE 76 (socket rear) at rear fuse box
GREEN (passenger turn signal)-------------------------BLUE at passenger side light connector
BROWN (taillight signal) ---------------------------------Light blue/ Blue line at passenger side connector
YELLOW (drivers side turn signal) -------------------- PINK at drivers side light connector

The unit is meant to be installed on the drivers side but I installed it on the passenger side under the tail light connector. Because of this i used the extra green wire to extend to the drivers side light connector, that's why thew wire is also green and not yellow.

And here are a few pictures:

mono4lamar

I have a harness that separates the taillight and the brake. I would assume that the turn signal (of either side) would be a good input for the trailer module?

NCWolverine

Were you able to sort out the separate taillight and brake connector situation?

SquareBox

[QUOTE=C300fan2;7512791]Just completed the install of CURT 56146 Powered trailer wiring into the GLK250 with Led lights.

I needed a fuse tap and some wire to complete the install. I also covered the wire with wire loom just for protection and presentation.

Wiring is as follows:

CURT UNIT --------------------------------------------------MERCEDES

WHITE AND RED (ground) ---------------------------- Vehicle chassis ground
BLACK (12v power)-----------------------------------------FUSE TAP AND FUSE 76 (socket rear) at rear fuse box
GREEN (passenger turn signal)-------------------------BLUE at passenger side light connector
BROWN (taillight signal) ---------------------------------Light blue/ Blue line at passenger side connector
YELLOW (drivers side turn signal) -------------------- PINK at drivers side light connector

The unit is meant to be installed on the drivers side but I installed it on the passenger side under the tail light connector. Because of this i used the extra green wire to extend to the drivers side light connector, that's why thew wire is also green and not yellow.

And here are a few pictures:







@ Q300 Fan, seems to me you are explaining the wiring in reference to the curt colors, can you share what colors to what on the Mercedes plug side do? I.e drivers side signal wire is pink, what are the colors on that plug for tail light and stop light?
Appreciate any help. Cant find a 2015 GLK250 tail light wiring diagram. Thanks.

C300fan2

[QUOTE=SquareBox;8505704]the Mercedes Colors are referenced as well first the curt color then the “……….” Then the Mercedes Color and location

SquareBox

[QUOTE=C300fan2;8505773]Thank you, I see that now on the computer, not so clear on the phone. Would you know what color the break lights are on the plugs? Thanks again.