Trailer Brake Controller Installation in 2017 Mercedes-Benz Sprinter 2500

Question

Question:

2017 Mercedes-Benz Sprinter 2500 I need to add a trailer brake controller. I have the trailer package. Trailer lighting wiring is in place. Just curious if the vehicle is ready for a plug and play controller. Thanks.

asked by: Will

0

Expert Reply:

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 with a circuit tester like # PTW2993 to confirm their function since vehicle wire colors are not always consistent.

A brake controller like the Prodigy P2 # 90885 has 4 wires that require connection to the Sprinter.

The black wire is 12V input power to the controller. This wire should connect to the vehicle wire that has a steady 12V signal when you test it.

The red wire on the controller is for the input signal from the brake light switch. This red wire should connect to the vehicle wire that has a signal on it ONLY when you press the brake pedal. If you cannot find this wire you will need to install Roadmaster Stop Light Switch Kit # RM-751475 which will give you the brake pedal signal needed to trigger the controller.

The white wire on the controller is ground and this this can be routed directly to the battery negative terminal, or to the ground wire at the plug.

The blue wire is the controller output signal that gets routed to the brake circuit pin on the 7-way.

expert reply by: Adam R

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Answer 1

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…

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Answer 2

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 3

To determine why you do not have any power on the blue brake output wire, I recommend starting at your brake controller. First, make sure the brake controller is on and receiving power. Most brake controllers have 4 wires, blue (brake output to…

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Answer 4

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 5

The red wire on a brake controller signals the controller that you are stepping on the brake pedal, so it has to be connected. It does not operate the brake lights on the trailer. It attaches to the cold side of the brake switch. The brake switch is…

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Answer 6

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 7

The Tekonsha Prodigy P3 Trailer Brake Controller #90195 along with the wiring harness #3063-P is all that is needed to add your controller to your Sprinter with Factory Trailer Plug. Since you are not getting power, you should check fuse F55 which is…

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Answer 8

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 9

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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Answer 10

That is a tough question to answer as both are excellent manufacturers with their respective pros/cons. In regards to brake actuators, they both make and manufacture them here in the U.S.A. and they both come with a one year warranty. In regards to…

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Answer 11

Only Rockwood would be able to find the wiring diagram you are looking for, but we might be able to help in a different way. If you use a circuit tester like part #PTW2993 you can probe the wires of the vehicle when various taillight functions are…

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Answer 12

I reached out to the manufacturer, TST, for you about the TST TPMS for RVs - 6 Tire Sensors #TST-507-RV-6-C and TST TPMS for RVs - 6 Flow Through Tire Sensors #TST-507-FT-6-C. I was told that for your set up, with rubber valve stems and steel valve…

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