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

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?

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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.

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Conner L
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Instructions for HM48035Instructions for 47405
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