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This Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector makes hooking up trailer lights straightforward. It uses original OEM-style connectors that plug directly into the existing vehicle wiring. There’s no cutting, taping, or splicing needed—just connect both ends until the locking tabs click into place and it’s ready to go.
The harness tucks behind the rear interior panel for a clean setup. You can keep the 4-flat plug inside until towing time or route it permanently outside through an existing rubber grommet. That keeps the wiring protected from the elements and avoids drilling new holes.
The integrated powered converter ensures proper signal transfer from the vehicle to the trailer lights. It includes circuit protection that keeps both systems safe if a short or overload occurs. The converter is designed to handle up to 2.1 amps per side for stop and turn signals and up to 4 amps total for running lights, giving you dependable lighting every trip.
The standard 4-pole flat connector provides the basic lighting functions—running lights, turn signals, and brake lights—so small and mid-size trailers can be safely towed. Compatible accessories like a 48-inch extension loop or a mounting bracket can be added when you want more reach or a fixed outside mount.
Customer Satisfaction Score:
84% were satisfied with this product
16% of customers were not satisfied
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Victoria H.
4/8/2025
I'm happy to hear the install videos came in handy for you Brian! Hauling anything fun?