Function of Blue Wire on 7-Way Round Trailer Connector

Question

Question:

Why do I need the blue wire on a 40 foot semi trailer? What does it control?

asked by: Doug B

0

Expert Reply:

Sounds like you are referencing the blue wire of the 7-way round connector like what's in the attached picture. If you have no use for an additional 12 volt circuit then it would not be needed. It isn't always needed so it sounds like you may not need it at all.

expert reply by: Jameson C

0

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Answer 1

The blue wire is for brake output power to the trailer brakes. One end connects to the brake controller and the other end goes to the pin in the trailer connector on the vehicle side that is for the trailer brakes. The Adapter 6 Pole to 7 Pole…

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Answer 2

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 3

Yes, you will only need to run one blue wire from your brake controller to the 7-way connector on the back of your motorhome, this wire is what takes the signal from your brake controller to your tow dolly to tell your dolly how much braking power…

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Answer 4

As you can see by the accompanying diagram I added, a 6-way such as the Pollak #PK11609 does not have a function for reverse lights; that function is on a 7-way so you would not connect the wire you referenced to your trailer connector. A 6-way has…

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Answer 5

The blue wire coming from the back of your Tekonsha Voyager Brake Controller #39510 is for brake output to the 7-Way connector. This wire should only have power with the brake pedal depressed or the manual override activated on the brake controller.…

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Answer 6

If the vehicle you are towing with has separate stop and turn signals then it will need to be wired with a Modulite converter so that it can run the lights on the vehicle you are towing that does not have separate turn signals and stop lights. If the…

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Answer 7

Your 2016 Ram 1500 will not require a brake light relay, the RV turn signals will not override the brake light when you are using the Demco 4-Diode Universal Towed Vehicle Wiring Kit with 7-Wire to 6-Wire Coiled Connector #DM9523010-54.

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Answer 8

The decision for me would come down to how long you plan to keep your Maverick or if you have other cars you might flat tow. Both the Patriot and Stay-IN-Play Duo are going to do a great job, but they are different styles. The Demco SBS Stay-IN-Play…

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Answer 9

If you are looking for a way to power the trailer brakes you would not run the blue wire of the 7-way to the positive post of your battery. Instead you would run that wire up to the blue wire of a brake controller like the part #90885 that you…

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Answer 10

The blue wire will connect to the reverse light circuit on the tow vehicle, but it will also send a signal to disengage the brake actuator on the trailer when you put your vehicle in reverse. So when you are in reverse, the trailer brakes will not be…

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Answer 11

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 12

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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Function of Blue Wire on 7-Way Round Trailer Connector

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