Troubleshooting Running Lights Flickering on Trailers and 2011 Ram 3500

Question:

I have pulled two different trailers, a fifth wheel and an enclosed utility trailer. i have had the same symptoms pulling both trailers. This leads me to believe that it is my trucks wiring that is causing the issue. I have noticed 2 issues. 1 When connected to to the trailers, on a bumpy road, The running lights on the trailer and my taillights on the truck will flicker on, and off. To me, this suggests a ground issue. 2 When my lights do stay on, It is like my taillights on my truck are lit up like I am on the brakes. Seems like brake lights are on my truck when they should be just in the running mode,taillight when I am connected to a trailer. When I am not hooked to trailer, all functions on my lights for the truck function properly. No issues. Any ideas on how I can test my trucks trailer wiring for these issues? I have a Ram 3500 dually with the factory brake controller Thank you,

asked by: TERRY L

Helpful Expert Reply:

I agree that the problem most likely originates on your 2011 Ram 3500. Although it is possible that it is a ground issue it is also very likely that the connector on your Ram is the root of the problem. First simply make sure that your trailer connectors are remaining secure and they don't have any play when installed.

Next check out the connector itself and make sure that it is clean and free of corrosion or debris. If it is dirty clean it out and add some dielectric grease like part # 11755 as this not only helps to keep it clean but it also helps protect against water causing any damage.

If the connector looks good then you also want to look at the wiring itself. If there are any places where it is damaged or shorting against another wire then that can cause issues as well. I have attached a diagram of the wiring configuration for a 7-Way as well as a 4-Way for you to reference.

If you are still having issues after this then your next best bet would be to take your Ram in to a shop and have them look at it. You may be able to trace some wiring and check the grounds but usually the wiring gets pretty complicated and is difficult to troubleshoot unless you have experience working on vehicle electrical components.

expert reply by: Jon G