7-Way Round to 4-Way Flat Adapter for Semi Truck

Updated 08/28/2024 | Published 08/24/2024

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)

$4.80

Hopkins Tail Light Converter - LED Compatible

(45)

$24.94

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

(120)

$19.29

Question:

Hey, Im looking for a plug adapter to go from my 7 pin round semi truck to a 4 pin regular car trailer. Any help would be greatly appreciated even if I have to get an adapter from 7 round to 7 blade then 7 blade to 4 pin. I do not need to control the trailer brakes just the lighting/turn signals. Thank you.

asked by: Richie F

Expert Reply:

Hi Richie; there are no adapters that are designed for this but you can make your own. A standard adapter like the # 47405 works with your standard 7-way and trailer wiring which doesn't require a converter. The lights on your semi are separate which means a converter will be required to make it compatible with the combined lights on your trailer. You can put this together using the Pollak 7-Pole Round Pin Connector # PK11700, Hopkins Tail Light Converter # HM48847, and Hopkins 4-Way Flat Trailer Connector # HM48035.

expert reply by: Robin H