Trailer wiring for a 2014 GLK 350 - Mercedes-Benz Forum
 
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post #1 of 2 (permalink) Old 10-11-2016, 10:28 AM Thread Starter
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Date registered: Oct 2016
Vehicle: 2014 GLK 350 $Matic
Location: Apex and St James, NC
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Trailer wiring for a 2014 GLK 350

I just installed a trailer hitch on my wife's GLK, that part was easy, not hooking up a Tekonsha TCI module for the lights. All installed, the directionals work fine, but having trouble with the stop/tail lights. According to posts elsewhere, the pink in left side harness and Blue in right are the turn signals, and that's correct, because they work fine.
Problem is some say the stop/tail are multiplexed on one wire in the left side, and that's Black/Grey. If i hook this to the stop light sensor per the manufacturers instructions, the tail lights on trailer are on all the time, but the stop lights don't do anything.
Can anyone confirm the lights are multiplexed, my test device shows they are.
Many thanks
Neil
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post #2 of 2 (permalink) Old 05-06-2019, 05:12 PM
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Date registered: May 2010
Vehicle: 2015 GLK 350
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wiring harness install

Neil,
What wiring harness did you install? Do you have any DIY pics and instructions? My GLK is a 2015, but I'm thinking its close to the same.
Thanks,
Chris
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