2018 Jeep Grand Cherokee | U-Haul Trailer Wiring Harness Installation

[@JohnGeib-je3fk]

do i need to run the power wire to the battery if im not using a trailer with brakes?

[@trailerhitches]

Yes. the power wire is for the convertor box to draw power from battery in order to send electricity to the trailer on your 4 flat connection, illuminating the bulbs on the trailer. Trailer brakes are an entirely different set of wires and part of a 7 way wiring setup, not this 4 flat quick connect.

[@rubeno.702]

Hello so you lost me at 7:46 where did that black wire come from?

[@mcintirefamily]

Is the wiring install for the other plug that you need that is not a 4 prong but the plug that has a bunch of prongs for a certain trailer that had a round plug? Not sure what it’s called.

[@trailerhitches]

This is for a 4 flat wiring install. A 7-way or 7-round has more functionalities and needs to have a more complicated install, including a brake controller. Some Jeep Grand Cherokees are pre wired for this and can have the functions turned on by a Dealership. To help you determine this please schedule a free Pre tow inspection with your local U-Haul hitch professional.