2017 Ram 3500 7-Way Not Sensing Brakes

Updated 10/03/2023 | Published 10/02/2023

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Dielectric Grease for Electrical Connectors, 2 oz.

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Question:

I have a 2017 ram 3500 with oem 7 pin wiring. We have been having an intermittent check trailer wiring and trailer brakes disconnected message. I have been trying to troubleshoot the issue and now the oem system will not sense the brakes at all. Trailer is a 2021 shockwave 5th wheel.

asked by: Larry V

Expert Reply:

in order to determine the specific problem you will need a circuit tester to test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring.

If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they are correct then your issue is likely going to be with the trailer side wiring. You will also want to check both your vehicle and trailer connectors for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to replace the plug with # 18004 for the trailer side or # 74682 for your truck. You'll also need to make sure your grounds are attached to bare metal surfaces and free of any paint, dirt or corrosion.

I have added a link below to a help article on trailer wiring for you to take a look at which may also be of use. Additionally, to help prevent any type of corrosion in your connector, and increase its durability and lifespan I highly recommend using Dielectric Grease for Electrical Connectors # 11755.

expert reply by: Kyle S