Will the 7-Way Round Pin to 4-Flat Adapter Work On a Semi

Updated 08/09/2021 | Published 08/07/2021

Products Featured in This Question

Adapter 7-Pole Round Pins To 4-Pole Flat

(49)

$9.85

Hopkins 4-Way Flat Trailer Connector w/ 48" Harness

(53)

$6.55

Hopkins Tail Light Converter - LED Compatible

(45)

$24.94

Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector - Trailer End

(120)

$19.14

Question:

On semi trucks without a trailer, would this adapter allow you to plug in 4-pin tow lights? If so, would brakes, turn, and taillights all work or would one of these functions be lost?

asked by: NLA

Expert Reply:

I do have an option for you but the 7-Way Round Pin to 4-Flat Adapter part # 47405 won't work on semi's as there is no converter integrated into the adapter. The lights on a semi are separate and the lights on a trailer are combined so a converter is required. Therefore, you will have to make your own adapter using the Hopkins Tail Light Converter part # HM48847, 7-Round Connector part # PK11700, and Hopkins Wiring Harness with 4-Pole Flat Trailer Connector part # HM48035.

expert reply by: Conner L