How To Find Cold Side Of Stop Light Switch On Vehicle For Brake Controller Installation

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Question:

Hi, where can I find the the cold side of brake switch to attach to the brake controller, what color is the wire and where is it located. Thanks

asked by: Alessandro

0

Expert Reply:

Normally you can find the brake light switch under the dashboard at the top of the brake pedal. There could be a number of wires attached to the switch so you can use a tester like part # PTW2993 to test the wires. Since the auto manufacturers can use different color wires it is always best to use a tester and check the wires for function and not color.

You would need to find the wire that only shows power when the brake pedal is pressed. That would be the wore that gets attached to the red wire from the brake controller.

If you want to let me know the year, make, and model of your vehicle I may be able to provide more information for you when installing a brake controller.

expert reply by: Jeffrey L

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Aaron

5/10/2020

I have a reese brake controller, Brake-EVN proportional. I don't know where my cold side connection is on my 99 dodge ram 1500. To connect the red wire to the stop light switch.

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Chris R.

5/13/2020

To find the right wire, you'll just need to use a circuit tester on the wiring behind the brake pedal. You're looking for the wire that ONLY gets power when stepping on the brake pedal (and no power with any other function). Unfortunately I wasn't able to track down what color this wire might be on your 1999 Ram 1500.

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What F.

9/20/2020

What if you have air barkes? (I have a 2004 Ford

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Jon G.

9/21/2020

@W I'm not super familiar with air brakes but from my understanding there should still be a cold brake light wire somewhere - you'll just have to use a circuit tester like what Jeff and Chris mentioned. If you absolutely cannot find one then installing something like the Roadmaster Universal Stop Light Switch Kit # RM-751000 might be your best solution.

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Answer 1

Rick, yes you are going to need to install the brake lite relay kit with your Roadmaster EvenBrake #RM-9400. The brake lite relay #RM-88400 is included so you should not need to buy another one. Roadmaster states in their instructions that diodes…

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Answer 2

Hi Scott, To get the motorhome's traffic signals through to your F-150's tail lights you'll also need some diodes and 4-pole wiring #RM-152 to go along with the #RM-910030-7, #RM-910030-5, and #RM-156-25. I do see that you…

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Answer 3

It sounds like your 2008 Ram 1500 has a factory 4-way connector instead of the factory 7-way connector. To add a 7-way connector you will need the #ETBC7 which will plug into your 4-way connector and you will just need to make a few more…

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Answer 4

The cold side of the brake light switch on your 2018 Ford F-150 should be a purple/white wire but I really encourage you to test it with a circuit tester.

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Answer 5

You will need to use a circuit tester, like part #PTW2993, to test the wires under your dash. That is where your stoplight switch is located. We have a video of a 1993 Chevy Suburban being fitted with a brake controller. Start at the 7:20 time mark…

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Answer 6

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 7

The first thing you are going to want to do is check under the rear bumper near the spare tire for a wiring plug called a US Car Connector which you can see a photo of attached for you. If you have this plug then all you will need to install both 4…

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Answer 8

You will need to hardwire the brake controller to your 2008 Dodge 1500. Because the wires have all been cut it would be best to run all new wires so you know it is done correctly. The four wires coming from the brake controller are White for ground.…

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Answer 9

You can absolutely move the Roadmaster Even Brake #RM-9400 to a different vehicle. If you don't want to remove everything from your current vehicle or if you just want the option of towing a second vehicle, then I recommend the Roadmaster Second…

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Answer 10

The Blue and Orange (or Red) wires are meant to carry the 12-v accessory power and the brake control output to the 7-way installed at the rear. The wires terminate in the engine compartment under the master cylinder. The red wire would be lengthened…

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Answer 11

When wiring a 7-Way on your trailer with 5 wires, your green wire will be right turn/brake, the yellow wire will be left turn/brake, the brown wire will be the taillights, and the white wire will be the ground. You will want to find out if the blue…

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Answer 12

The blue wire on a 5 way plug can be used for reverse lockout function (on surge brakes), or can be used for electric brake signal depending on how your specific trailer is wired. Most 7 pole to 5 pole adapters are wired for the reverse lockout…

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How To Find Cold Side Of Stop Light Switch On Vehicle For Brake Controller Installation

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