I Have Curt Flat Tow Wiring for My 2024 GMC Sierra 1500 4 Flat, How do I Put a 6 Way Connector?
Updated 09/26/2025 | Published 04/27/2025
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Question:
I have a Curt wiring with 4 flat output. I need the 6 pole harness that attaches to the toad that has a 4 way connector and also allows for a power input for the trickle charger. What product?
asked by: Ryan
Expert Reply:
Hello Ryan,
Since you have the Curt flat tow wiring with the 4-flat connector, you'll want to cut that connector off and install the RoadMaster 6-Wire Trailer Connector - Vehicle End # RM-910030-7. Don't forget to grab the bracket as well # RM-910030-5.
You'll also be able to run the Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 through the 6-way connector.
I've attached an image of Roadmaster's wiring diagram for the 6-round for your reference.
Is this the missing piece to your flat tow setup, or are there other components you’re still needing? I also attached a helpful article on the essential components for flat towing, it’s a great read whether you're a seasoned flat tower or just getting started!
Product Page this Question was Asked From
Demco Classic Base Plate Kit - Fixed Arms
- Tow Bar Base Plate
- Fixed Draw Bars
- Visible
- Demco
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Kate F.
9/26/2025
Hey Ryan, Did the RoadMaster 6-Wire Trailer Connector and Battery Charge Line Kit help complete your flat tow setup, or are you still looking for other components? I’d like to hear your outcome because it could give others confidence when ordering replacements.