Choosing The Correct 4-Way Vehicle Wiring Harness on a 2020 Mercedes Benz GLC 300

Question

Question:

I cant find the connector for the T connector for the trailer wiring harness.

asked by: Yelinton G

0

Expert Reply:

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 on both the drivers and passenger sides(see instructions linked below).

If these connectors are not present you will need the Vehicle Wiring Harness Kit # C59496. This kit includes a test light that allow you to identify the correct wires to tap into your your GLC.

expert reply by: Bud M

0

Answer 1

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…

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Answer 2

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 3

Hello Sami, thanks for reaching out. According to Tekonsha, the #118747 wiring harness is correct for the 2022 Mercedes-Benz GLC 300 4matic SUV. The only known exclusion is the premium package. Those models do use a different connector, but it…

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Answer 4

There are only two ways the #118747 won't line up on your 2021 Mercedes-Benz GLC. The first is if you have the coupe and not the SUV. The other is if you have the premium package. Neither of these are compatible with this wiring harness. If that…

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Answer 5

According to Tekonsha, it's the PO3 Premium package that would prevent the #118747 as the connectors on the taillight wiring harness are different. From what you describe, I'd agree, it doesn't seem like you have the PO3 package, but you…

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Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

Hey Jonathon thank you so much for all of that additional information! To haul your bikes behind your class C Sprinter motorhome, while flat towing your Mini, I recommend the Hollywood Racks RV Rider Bike Rack item #HLY64FR and the Roadmaster Dual…

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Answer 8

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 9

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 10

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 11

Hey Kelvin, welcome back. To flat tow a 2026 Ford Maverick with your Demco Commander II Tow Bar item #DM9511012, I recommend the following parts: Baseplate Kit - Demco Tabless Base Plate Kit item #DM38CV Wiring Harness - Roadmaster Diode 7-Wire to…

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Answer 12

Hey Doug! The Firestone Ride-Rite Air Helper Springs #F35FV are the right kit for your 2026 Ford F-350 FX4 dually. However, you will need to measure to be sure it fits. The distance from the top of your rear axle to the top of the jounce bump stop…

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Choosing The Correct 4-Way Vehicle Wiring Harness on a 2020 Mercedes Benz GLC 300

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