How To Install a Brake Controller on 2017 Mercedes-Benz Sprinter 3500

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Question:

trying ti install a brake control on a 2017 Mercedes Sprinter chassis 3500 sun-seeker , the coach has 7 way on the tail-end , and under the drivers seat i located 3 plugs 1st one is white has 4 poles in it and has 3 hot , 2nd one was gray just has 3 poles none hot , 3rd one has 2 poles non hot . if t is not equipped with a plug in style can I hard wire , i have heard of people having problems with that system on a hard wire job .

asked by: Guy S

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Expert Reply:

You can hard-wire in a brake controller, and it seems that there are not a lot of the Sprinter 3500 models that are pre-wired, at least from what I've seen in my research. I have not seen any reports that this isn't possible, and we even have an installation video to walk you through the process.

The way to find out whether or not the plug is present by using a circuit tester like the # PTW2993 and testing for a hot wire when the brake is pressed- it's possible that one of the plugs that you've already tested and was not hot, is in fact hot when the brake is pressed. If you're able to find that plug, you can use the Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # 3063-P (this is not a universal plug, but if you let me know what model brake controller, you're installing I can let you know if it works).

If you don't have a hot wire when the brake pedal is pressed, you'll need to hard-wire in your connection to the brake controller. You will need to wire in a separate brake signal switch wire with the Roadmaster Stop Light Switch Kit # RM-751475, as well as making connections to the 12v power, brake controller wire and ground connection. I've attached a detailed video on how to hard-wire in a brake controller on the 2017 Mercedes-Benz Sprinter 3500 that shows how to complete all of these tasks and get a fully working brake controller in your vehicle.

expert reply by: Erik B

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Answer 1

According to my research, if your 2017 Mercedes-Benz Sprinter 2500 came with a factory 7-way trailer connector then you will have the brake controller connector pre-wired. This pre-wired connector should be under the driver side seat which you can…

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Answer 2

The red wire on the brake controller connects to the stop light wire on the brake switch located above the brake pedal. You will need to use a circuit tester like #PTW2993 to probe the wires. You need the one that shows a signal ONLY when the brake…

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Answer 3

I wish there was a simple plug-in option for installing a 7-way on your 2015 Ford F-150 but there isn't at this time. Now if your trailer does not have brakes all you would need is the part #37185 as an adapter to convert the 4-way to a 7-way. If…

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Answer 4

As long as the controller is installed parallel to the direction of travel, and is level on a side-to-side plane, you can certainly mount the Tekonsha Prodigy P3 #90195 at a 45 degree angle to match the slope of your vehicle's dashboard. If you…

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Answer 5

Thanks for the pictures! You can't mount it upside down. There's a mercury switch in the G-Force Controller item #DM78VR which is what senses the deceleration and triggers the braking system. The system works off of inertia so it has to be…

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Answer 6

If Mercedes installed the factory brake controller harness on your 2016 Mercedes Sprinter Motorhome, it would be under the driver's seat. It would have a green connector. If the harness is not under the seat, then from our experience, it was not…

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Answer 7

Assuming your Sprinter has the factory tow package with the 7-way at the rear bumper, in addition to the #RED24FR Redarc Tow-Pro Liberty Brake Controller, you'll also need the #3063-P wiring harness and the #331-TPH-017. The connector to install…

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Answer 8

The correct brake controller adapter for a Tekonsha brake controller in your 2018 ACE motorhome built on a 2017 Ford F-53 is the part #3035-P which plugs into a port located near the emergency brake pedal as shown in the linked photo. For a brake…

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Answer 9

There are some wires that are hot all of the time which is why we usually try to emphasize that the brake controller, like the Prodigy P3 #90195, needs to be connected to the cold side of the stop light switch when installing the Kit #ETBC7.…

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Answer 10

There is no plug-and-play brake controller harness for the 2017 Mercedes-Benz Sprinter 2500 so brake controller installation will be a hard-wire process. Under the driver's seat there should be a green plug. The wires to this plug can be tested…

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Answer 11

The ground (cold side) of the brake light signal in a Sprinter can sometimes be found in the wiring above the brake pedal. A high-sensitivity LED circuit tester will be required to test this due to the weak signal strength in this wire. This is due…

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Answer 12

You are correct, you should only be getting output when the brake is applied, or the override switch is activated. It sounds like the controller might be bad, but to make sure, you should probably bench test it before tossing it. Use a circuit…

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How To Install a Brake Controller on 2017 Mercedes-Benz Sprinter 3500

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