Adding 7-Way and 4-Way Connectors to a 2003 Ford F-250 with Factory Square Plug Behind Bumper

Updated 06/22/2018 | Published 06/20/2018

Question:

I am looking for an aftermarket 7 way Harness something that will plug into the factory square plug behind the bumper on my 2003 f250 along with a matching 7 way / 4 way plug similar to the original

asked by: Andrew T

Expert Reply:

We do have a solution for you that plugs into the square plug on the rear of your 2006 Ford F-250 but it will require 2 piece to get you to a 7-Way and 4-Way combine connector.

Start off by installing the Hopkins Connector # HM40165. This has a 4-Way connector and a loose blue wire as well as a loose red wire.

The next step is to install the Hopkins Adapter # 37185 which has a 7-Way and a 4-Way connector. The 4-Way on the adapter will connect to the 4-Way on the 40165 and then you simply need to splice the blue wires together and splice the red wire from the 40165 to the black wire on the 37185. Ground the white wire with the ring terminal to a clean, bare-metal surface and then connect the purple wire to your reverse light function (this is the typical function it is connected to but you can connect it to any other function to match up to your trailer 7-Way connector).

expert reply by: Jon G