Wiring A 7-Way Harness For A 2010 Mercedes GLK350

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Question:

Hi - I have a 2010 Mercedes GLK 350 with the Curt Hitch, and need to figure out a way to hook up a standard 7-pin male trailer hookup from a Featherlite trailer. Everything Ive found online is for connecting a 4-pin setup. Is there anything that exists for this option for this vehicle? Thanks in advance for any help.

asked by: Matt S

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Expert Reply:

We do offer an option for your 2010 Mercedes-Benz GLK350. You will have to install a 4-way harness and then a universal installation kit that uses the 4-way harness along with additional wiring to make a 4-way to 4-way and 7-way adapter. Always test the wires by function and not by color as auto manufacturers may use different color wires for different functions.

Since your GLK350 has a Pulse Width Modulation System ( PWM), The 4-way harness I recommend is part # 119250KIT. This has the required powered converter, and the needed hardware for installation. I have linked you to an FAQ article for wiring.

I would then recommend the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat, part # ETBC7. This kit will plug into the 4-way, and then you will have to attach the remaining wires. The black wire from the 7-way will go to your 12 volt battery, the purple wire on the 7-way will attach to the reverse light wire, and the blue wire will attach to the brake controller. This kit includes the hardware needed for installation and does include a circuit tester. I have linked you to some FAQ articles for this kit.

I would also suggest a no-drill long bracket like part # C57202. This attaches to the hitch and provides a sturdy mount for the 7-way bracket and harness. I have linked you to a product review video for this bracket.

expert reply by: Jeffrey L

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Answer 1

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 2

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 3

Yes, we do. To add a hitch to your 2024 Toyota Grand Highlander, I recommend the Curt Trailer Hitch item #C26VV. This hitch is custom fit and bolts to your Toyota with included hardware. This is a class III hitch with a 2" receiver. It has a…

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Answer 4

To add a hitch to your 2024 Toyota RAV4, I recommend the etrailer item #e23ZR. This hitch is custom fit and bolts to your Toyota with included hardware. This is a class III hitch with a 2" receiver. It has a 4,000 lbs towing capacity, and a 600…

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Answer 5

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 6

As far as wiring for the 2024 Toyota Grand Highlander, we do have the Curt #C59236 available which is more of a universal hardwire harness. Unfortunately there are not any plug-and-play options that have been confirmed to fit as of yet (October 4,…

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Answer 7

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 8

Yep, so long as your 2024 Subaru Crosstrek Wilderness is not a hybrid both the Curt and etrailer hitches will fit: - Curt Trailer Hitch Receiver #C13382 - etrailer Trailer Hitch Receiver #e98912 The only difference besides price is the finish; the…

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Answer 9

To add a class III hitch to your 2024 Honda CR-V hybrid, I recommend the Curt Trailer Hitch item #C13397. This hitch is custom fit and bolts to your CR-V with included hardware. It is a class III hitch with a 2" receiver. I really like this…

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Answer 10

Class I and Class II hitches both have a 1-1/4 inch receiver opening. The difference is that a Class I hitch has a lower tongue weight rating, usually 200 pounds and a lower towing rating, usually 2,000 pounds. A Class II hitch usually has a tongue…

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Answer 11

I definitely understand being a bit overwhelmed by the amount of options in front of you, however I can definitely help with differentiating the trailer hitches for your 2019 Subaru Outback Wagon along with explaining my personal recommendation,…

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Answer 12

There is only one difference between the Curt Trailer Hitch Receiver #C13176 and etrailer Trailer Hitch Receiver #e98909 that fit your 2020 Chevrolet Colorado, which is the finish. The Curt trailer hitch has a glossy black finish while the etrailer…

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Wiring A 7-Way Harness For A 2010 Mercedes GLK350

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