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Troubleshooting Problem with Trailer Connector on 2014 Ram 1500 with 7-Way Functioning and 4-Way Not


My running lights will not work on my trailer so I checked the ones coming from the truck and its a plug with two different connections. Ones a 4 pin and one is 7 pin. The 7 pin all works on truck side. But the 4 pin everything works except running lights. We replaced it and same problem. No wiring exposed. Not sure what to do. Thanks


Expert Reply:

It sounds like you have a trailer connector that has gone bad. I recommend replacing it with the 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End # HM40975 which will fit in your factory location or use the included bracket. Because you are getting all working pins on your 7-way, the connection itself is the issue because it uses the same wires for both connections.

I recommend putting dielectric grease like # 11755 on your connection to your factory wiring as well as the connections for your 7-way and 4-way under the spring loaded covers. This grease will help the electrical connections and will also keep water and debris out of the connections to prevent corrosion.

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