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How to Install a 7-way and 4-way # HM40975 on a Vehicle with a 4-Way Round


I have a 2005 and a 2008 International 4300 flat bed tow trucks. They both currently have the factory 4 pin round lights only connectors on the back. Im looking to add a 7 pin blade RV style connector and a standard 4 pin connector to it. Looking for a mount that looks like this one: HM40975 Were pretty much only using the different plugs for lights only, but we tow a lot of different types of trailers and would rather not use a bunch of adapters like we currently do.


Expert Reply:

We have what you need. It sounds like you have a 4-way round on your trailers like the part # PK11404 already installed on your trailer. So what you will need to do is first cut the 4-way off of your tow vehicles and then wire the wires that previously ran to the 4-way to the Harness part # PK11998. You will want to run the running light circuit to the brown wire, the ground to the white wire, the left turn/stop circuit to the red wire and the right stop/turn to the green wire. The rest of the wires will be taped up and not used.

Once you have that harness wired up to your truck wiring you could easily plug in the part # HM40975 to the end of the harness and you would have a 7-way and 4-way you could use for your trailers.

expert reply by:
Jameson C

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