Components Needed To Install A 7-Way On A 2018 Ram ProMaster City

Question:

Looking for a 7 pin round wiring for a 2018 Ram ProMaster City. Can you recommend something? Thanks

asked by: Charles M

Expert Reply:

Hi Charles,

Assuming that you don't currently have any wiring you'll going to need to start with the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118719. This wire harness has connectors to easily tee into your factory tail light wiring and provide you with a 4-pole connector.

From there you can install the # ETBC7, which will come with the rest of the components needed for a 7-way and would also allow you to install a brake controller of your choosing. The 4-pole connector from the # 118719 will connect to the 4-pole on the # ETBC7 and the rest of the wires will connect in the following manner:

White - ground
Black - 12v power (battery) with provided 40 amp inline circuit breaker
Blue - output wire from brake controller
Yellow - reverse light circuit (really only needed if you have a trailer with surge brakes. I typically cap this off with some electrical tape)

If you don't plan on installing a brake controller right away I'd still run the wiring up from the 7-way into the cab and then just zip tie it up so that it's ready to go in the future. The 20/30 amp circuit breakers can be held onto and used when installing a brake controller.