Trailer 7-Way Wiring When Colors Dont Match

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Question:

The wiring harness on my trailer has a red wire and no blue wire. Its all original wiring. Can you help me figure it out ? 7 plug trailer wiring Thanks

asked by: David

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Expert Reply:

I'm happy to assist. The 7-way plug on your trailer will have the correct pin locations even if the colors don't match. It is not uncommon for different color wires to be used. I've attached a photo with the wiring location and function so you can match those versus the function. I've also attached a video and article to assist.

You can also use the circuit tester # PTW2993 to test power functions.

expert reply by: Jason S

0

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Answer 1

Wiring by function is the route to go for your situation. This is done by testing each wire of your trailer individually. The easiest way is to use a 12V battery and connect the negative terminal to the trailer's ground on the frame and then…

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Answer 2

The wire colors/functions listed on the page for vehicle side 7-Pole connector #PK12703 are just the most common ones. There is no standard for wiring color and function on vehicles or trailers. To wire up a new connector you will need to do so by…

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Answer 3

I have attached a photo for you below which shows how both a vehicle side and trailer side trailer connector is typically wired. I say typically because this is not always exact and so long as the trailer and vehicle side both match it will not…

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Answer 4

7-Way connectors like the #A7WCB that you referenced should be wired by function and not color. Since trailer manufacturers can sometimes use non-standard color wires for the taillight functions of their trailer it is best just to determine the…

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Answer 5

It should be getting close to 12 volts if the power output is set to the maximum on the brake controller. Some brake controllers will not work properly if they are titled or turned to the side or if it has a leveler knob that is not level. Check…

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Answer 6

The recommended lug nut torque for your 7,000lb axle depends on a few factors like wheel size, stud size etc. Check out the attached photo which shows the torque specs for a variety of applications. I see you were looking at the Dexter Nev-R-Adjust…

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Answer 7

Your brake controller should be getting 12 volts of power going into the brake controller. The wire that feeds power to the brake controller is the Black wire. You can test this wire by using a multimeter part #PT89ZR. The amount of power coming out…

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Answer 8

The wiring diagram for the Optronics 7-Way Round RV Style Trailer Connector - Trailer Side, when installed correctly will match a factory 7-way system or an aftermarket 7-way vehicle side connector on your 2015 Ford F-250. I have attached a trailer…

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Answer 9

I would recommend completely ruling out the bearings by closely examining them and the spindle for discoloration caused by overheating. If you have determined that it is the brakes that are hot, and not the hub itself, I would recommend readjusting…

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Answer 10

It's possible the left and right side brake assemblies were installed on the opposing/incorrect side they are intended for. While this would not change how the magnets power up it can negatively affect braking. If that's not the case, you may…

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Answer 11

Pull the hub off on the problem wheel. I bet your brake assembly has a mechanical problem and just needs to be replaced. For a replacement Dexter brake assembly for the right hand side of a 10k Dexter axle you would want the part #23-451.

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Answer 12

The controller is only putting out voltage when the manual switch is applied on the brake controller, but not when the vehicle brakes are applied, is that correct? The most likely problem is that the controller is not getting the input that the…

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Trailer 7-Way Wiring When Colors Dont Match

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