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

No Dennis, you shouldn't need an Adapter #DX35FR with the factory brake controller on your 2022 Chevrolet Silverado 3500. The only reason I say should and not will is because the software for your brake controller can be updated through the ECU…

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Answer 2

Yes, you can use the HydraStar Electric Over Hydraulic Actuator Adapter Module #HBA-CAM with the Dexter DX Series Electric Over Hydraulic Disc Brake Actuator #K71-651. In my experience I find the Hydrastar HBA-CAM is the most reliable module with the…

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Answer 3

You will want The HydraStar Control Adapter Module #HBA-CAM, to use your Hydrastar #HBA-16 unit with the factory integrated brake controller on your 2020 Chevrolet Silverado 3500. The factory brake controllers on 2007 and up GM trucks are not…

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Answer 4

This is a common question we get on lights like the LED Trailer Tail Light with License Bracket part #328-003-81LBM1. The original colors you have are the traditional trailer wiring code so brown=taillights, red=turn/brake and white is ground. On…

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Answer 5

Yes, a module like the Hydrastar Electric Over Hydraulic Actuator Adapter Module #HBA-CAM is going to be needed on a 2024 Chevrolet with factory brake controller. I have seen issues already reported of the factory brake not working on an electric…

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Answer 6

It is likely that the red wire on your old lights is the turn signal/brake light wire, and the black wire is the running light wire. That would make the white wire the ground. You can verify this by testing the wires using a circuit tester such as…

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Answer 7

Does your trailer have solar panels? We've heard of this issue and and it appears there is a tech bulletin out about how the solar panel kits on trailers make the truck have this issue and disconnecting helps. The tech bulletin is 23-NA-113 and…

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Answer 8

I have to go off the GM dealership recommendation. If they are saying you need the Hydrastar #HBA-CAM or Dexter #DX35FR adapter module for your factory brake controller to work with your electric over hydraulic brake actuator, then I can't really…

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Answer 9

In regards to the 4-way wiring harness you are trying to install; the white wire is for the ground, the brown wire is for the running lights, the yellow wire is for the left turn/brake light, and the green wire is for the right turn/brake light.…

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Answer 10

Here is the troubleshooting guide for you to use to determine what in your system is failing you. Could be one of three components being wiring, brake controller or actuator and this will help you identify which one it is. Detach all wires from the…

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Answer 11

What brake controller does your truck have? Typically the OEM integrated brake controllers in newer trucks can be a little problematic but the aftermarket ones like the P2 part #90885 work consistently really well. It's pretty common to see the…

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Answer 12

This is definitely something that is frustrating and unfortunately, my answer is not going to be much better. When we have brought this to Dexter in the past, they have told us that their Electric Over Hydraulic actuators like the Dexter DX Series…

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Trailer 7-Way Wiring When Colors Dont Match

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