Recommended Wiring Harness for 2005 Mercedes-Benz ML350 Special Edition with Factory Trailer Hitch

Question

Question:

I have a 2005 Mercedes ML350 special edition sub with a trailer hitch but they didn't install the wiring harness with it. I'm confused looking at your site as to which one I'm supposed to get? All I know is that it is supposed to have 2 wires for each side because it has a turn signal that is separate from the brake light and my trailer is the 4 prong hookup.

asked by: Joe

0

Expert Reply:

Don't worry, I can help outfit your 2005 Mercedes-Benz ML350.

The wiring harness that I recommend for your 2-wire system is the # 119250KIT. I have linked the instructions for you to see how the 2-wire system your ML350 has will install. You mentioned the two wires as turn and brake light being separate but you did not mention the tail light wire, you could in fact have a 3-wire system which the # 119250KIT will also fit, best thing to do is to use the included tester for all the functions per each wire of your multiplex wiring. You will need to find out if the tail light has its own dedicated wire, which means you would not see the other turn or brake functions on when holding the tester to it, if it does then you have a 3-wire system not 2-wire. I spoke to my installer, and he highly recommended the # 119250KIT for your vehicle's wiring, because it has some of the best components for your multiplex wiring system.

In my research of your vehicle, it may be possible that they did run the wiring for the hitch, the plug for this will be behind the fascia cutout surrounding the hitch, there should be tabs to remove this panel and expose the wiring harness.

I have linked the above-mentioned product to this page for your viewing and purchasing convenience.

expert reply by: Jackie C

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Answer 1

If you have a 7-way on your 2011 Mercedes ML350 and when you connect your trailer with LED lights you end up getting a bulb-out error code the 7-way adapter part #C35FR will work for you. There are load resistors in this adapter that increase the…

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Answer 2

German engineered vehicles such as your Mercedes ML350 do have problems with LED trailer lights. A powered converter could solve the issue but there are also special adapters that create more draw that will allow the affected vehicles to tow a…

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Answer 3

While there isn't a specific wiring harness to plug into a brake controller plug on your 2013 Mercedes ML350 the vehicle may have the Mercedes one stored somewhere or it could be available at a Mercedes dealer. Then you could wire in a brake…

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Answer 4

Yes, the Redarc Tow-Pro Elite Brake Controller for Tekonsha Harness #RED63RR was intended for that specific purpose! It comes with an adapter from the Redarc controller to a Tekonsha wiring harness so all you're doing is unplugging your current…

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Answer 5

While there isn't a specific wiring harness to plug into a brake controller plug on your 2015 Mercedes ML350 the vehicle may have the Mercedes one stored somewhere or it could be available at a Mercedes dealer. Then you could wire in a brake…

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Answer 6

First let's start with a hitch for your 2011 Mercedes Benz ML350. If you have a non BlueTec you would want the part #13342, if you have a BlueTec you would want the part #C13102. Since you wanted to do some towing you might be interested in…

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Answer 7

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 8

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 9

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 10

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 11

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 12

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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Recommended Wiring Harness for 2005 Mercedes-Benz ML350 Special Edition with Factory Trailer Hitch

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