Adapter For Trailer With 6-Pin Round Plug And Vehicle With 4-Flat
Updated 01/19/2026 | Published 08/12/2024
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Question:
I have a boat trailer with a round 6 hole connection My car has a 4 prong flat connection is there a way to get an adapter to connect the two
asked by: Kevin B
Expert Reply:
Hello Kevin. We do have an adapter you can use for this purpose. Take a look at the Adapter 4 Pole to 6 Pole and 4 Pole Trailer Wiring Adapter # 37175. This will connect to the 4 flat plug on your car and will allow you to connect the 6-prong round plug on your boat trailer. The white ground wire will need to be grounded to the vehicle frame. You can leave the other two wires disconnected, but this will only operate the lights on the trailer.
Product Page this Question was Asked From
Blue Ox 6-Wire, Coiled Electrical Cord with 6-Way, Round Plugs
- Flat Tow Wiring Harness
- Plugs into Vehicle Wiring
- Extension Cord
- Universal Fit
- 6 Round
- Blue Ox
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Jesse M.
1/19/2026
Hey Kevin, how did things go with the 4-to-6 pole adapter on your boat trailer? Were you able to get the trailer lights working as expected? Your update could make it easier for the next person with the same setup.