Trailer 7-Way Wiring When Colors Dont Match

Question

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

The Dexter electric over hydraulic actuator does not have its own adapter for use with the integrated controller on your truck. Titan BrakeRite EHB Adapter for Ford/Chevy Integral Brake Controllers, part #T4846000, will only work with the Titan…

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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

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 4

William yes, I can confirm that the Curt T-Connector Vehicle Wiring Harness #C88RV is what you'd need for your 2025 Chevrolet Equinox. If you're needing help with anything else, feel free to drop a comment before you go!

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Answer 5

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 6

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 7

The integrated brake controller of your 2022 GMC Sierra 3500 has a hydraulic mode which would allow it to work with electric over hydraulic actuators without needing an adapter. With that said if for some reason the controller wasn't recognizing…

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Answer 8

There are actually two ways that 7-way wiring colors are commonly seen. One uses a red wire and the other a purple. The circuits they represent do vary though. So check out the updated diagram I attached to this page and most likely you need to wire…

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Answer 9

The adapters which allow you to use factory brake controllers with electric over hydraulic brake actuators are not brand or make/model specific. Therefore you can use the HydraStar Electric Over Hydraulic Actuator Adapter Module part #HBA-CAM with…

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Answer 10

If you have a Hydrastar brand actuator on your trailer you could use the part #HBA-CAM and this would take care of your problem. But this only fits the Hydrastar actuators. If it's a Dexter BrakeRite you could use the part #T4845900. If you have…

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Answer 11

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 12

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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Trailer 7-Way Wiring When Colors Dont Match

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