How to Add a Second 4-Way Connector for Auxiliary Marker Lights
Updated 09/03/2026 | Published 08/25/2026
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Question:
Hi etrailer - I have a wiring question about my 2019 F150 that has the factory 7-blade and 4-flat trailer plug in the rear bumper. Im adding two marker lights to the rear of the truck, similar to what the raptor has on the rear corners - just two simple led 2-wire marker lights without turn signal or brake indications. Does someone make an adapter harness that plugs in to the back of the factory 7/4 plug in the bumper to provide a second 4-flat plug behind the bumper that I can hook into for power and ground and plug/seal off the other 2 terminals? Or is there an adapter harness that plugs in somewhere else to get power and ground? Thanks.
asked by: Rick H
Expert Reply:
Hey Rick.
I do have something for you. The Curt T-Connector # C55384 is exactly what you need. It will plug in to your 7-way directly in line with the factory wiring harness, and you can run the new 4-way into your bed or mount it however you'd like to plug in your new lights. No splicing required. This will also keep your 7-way open for something else if you need it.
Are you going for the Raptor look or did you have something else in mind?
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- Factory Tow Package
- 4 Flat
- 7 Blade
- Plug and Lead
- Plug-In
- CURT
more information >
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Rick H.
9/2/2026
Thanks Trent. I'm not trying to do the raptor thing just want a couple more marker lights back there and really don't like those tailgate light bars. Interestingly when I clicked on the part number you sent it says it's not confirmed to fit my f150?