Recommended Wiring Harness For A 2018 Mercedes-Benz GLC 300 Premium Model

Question

Question:

I have a 2018 MB GLC 300. I purchased your 118747 however the yellow clips on the end of the harness for driver and passenger side tail light connections do not fit. I spoke with your customer service and he has a picture of the connector I have coming from the tail light. Ive viewed your installation video for the MB GLC 300 and there is a bit of splicing involved. I understand the kit I purchased was supposed to eliminate the need for splicing but I believe the Premium package on my car makes the kit incompatible. I believe I may be able to use the kit in the following fashion. ...If I cut the ends of the harness to remove the yellow harness clips and use just the green wire passenger side and yellow and brown wire drivers side, then splice as follows: Drivers side Harness yellow into tail light grey with black stripe Harness brown into tail light black with purple stripe Passenger side Harness green into tail light green with brown stripe. Will this work? It seems to follow the color suggestions from your installation video... The attached pics show the clip tat goes into the drivers tail light. the other 2 show the harness ends Im suggesting I cut and then splice. Please advise. Thanks,

asked by: Jim H

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Expert Reply:

Thank you for the pictures. You are definitely on the right track here. The Tekonsha # 118747 is not intended for the models with the premium package. I will have customer service contact you for a return.

I do not recommend cutting the plugs off of the # 118747 and hardwiring it. The module is not intended to be hardwired, and would not function correctly. You also would void your warranty on the wiring harness. I would certainly not feel comfortable doing that, especially on a nicer vehicle like you 2018 Mercedes-Benz GLC 300. Instead you will want the Tekonsha # 119147KIT, which is intended to be hardwired.

I have linked an install video below if you want to take a look.

expert reply by: Jesse M

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118747 plugs
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MB GLC 300 Premuim
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Answer 1

The Tekonsha T-One #118747 wiring kit will fit any 2016 Mercedes-Benz GLC300 that doesn't have the Premium 3 Package. I spoke with my contact at Tekonsha who said that all of the GLC300s come with LED lights so we aren't sure if you have the…

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Answer 2

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Answer 3

The Isuzu NPR models are not factory wired for an electric brake controller. If you already have a 4-way trailer connector, then you will use the wiring kit #ETBC7 to hardwire your brake controller. If you already have a 7-way trailer connector, then…

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Answer 4

The yellow plugs on the Tekonsha T-One Connector #118747 you have for your 2018 Mercedes-Benz GLC get plugged into the factory tail light connectors behind the access panels on both the passenger and driver side of the rear cargo area which is shown…

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Answer 5

The Tekonsha trailer wiring kit part #118747 is a plug and play option that fits your 2019 Mercedes GLC 300 but does require running a wire up to the battery. This is because the taillights of your vehicle can't handle the amperage draw of the…

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Answer 6

The T-One Vehicle Wiring Harness #118747 for your 2020 Mercedes-Benz GLC 300 will only connect if you do not have the P03 premium package. The connectors for this harness are located on the tail light wiring harness located behind the access panels…

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Answer 7

For your 2021 Mercedes Benz GLC300 the trailer wiring kit you'd want is the part #118747 which is custom fit for an easy install and has a very reliable converter box.

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Answer 8

We have universal trailer wiring harnesses that fit your 2020 Mercedes GLC 300 with the Tekonsha part #119147KIT. This ties into the taillight wiring of your vehicle with included quick splice connectors.

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Answer 9

When an installed hitch sits too close to the vehicle exhaust/muffler it is not a big deal to slightly reposition the exhaust hanger (that suspends the exhaust on a rubber grommet) to provide more clearance. The linked article explains in detail. The…

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Answer 10

We can get your 2022 Mercedes GLC300 setup to tow a utility trailer. You will need the Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit, part #C59236. Once you add this harness kit you will be able to plug a utility…

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Answer 11

According to our technicians the 4-Pole Flat Trailer Connector item #118747 will not work with any of the Premium Packages on the 2016 GLC-300. You will need to use the 4-Pole Trailer Connector and Installation Kit item #C59496.

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Answer 12

For your 2021 Mercedes Benz GLC the correct trailer wiring harness is the part #118747 which plugs into the vehicle taillights for an easy install without splicing wires.

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