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How to Use a 4-Way and a 7-Way at the Same Time When the # HM40975 is Installed


I need to use both the 7 wire and 4 wire at the same time on a tow dolly with electric breaks. 7 wire for the tow dolly electric breaks and the 4 wire for the towed vehicle break turn signals lights. The door on your wont allow that, The 7 wire door needs to open up and the 4 wire door to open to the right. This will use of both plugs at the same time. The lights on a tow dolly are to far forward for safe car hauling. My F150 std. Receptical for towing is a bad idea.


Expert Reply:

If you already have the # HM40975 installed on your vehicle you could install the part # 118384 as well and then you would have a second 4-way that would be accessible while the 7-way is being used.

This 4-way will install inline with the 7-way harness and can be used at the same time as the 7-way.

expert reply by:
Jameson C

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