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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
Ratings & Reviews
Perfect
The hitch fit as it should. Took about 40 mins
The product I ordred was right on and no hassle
quick and easy installation. Quick shipping
Got the exact product I needed, super fast.
plugged it in and I was off and running
Great product and very easy to install. Plug in play, can't beat that.
Came on time easy to install had it installed in 5 minutes works good
Product was as described, fit like a glove and delivery was incredibly fast. But oh what amazes me the most, is a year after the purchase they actually followed up to see if I was still happy with the product. Our companies should take note, this is how good business is done.
Regards,
Fred Zaragoza
Fast delivery, excellent product; exactly what I needed after buying the wrong part locally! I'll recommend etrailer to all my friends and family.
I have not used the harness yet, but did test the connections via volt meter & everything checked out. . . .
Item was exactly what I needed to pull utility trailer behind my 2001 Grand Cherokee. It fit the existing Jeep plug exactly and was delivered quickly.
Plug-n-tow wiring connector was easy to connect, Not too bad to route. Could use a little more length.
Curt hitch install video was excellent, made it look easy. The bolt at the gas tank strap was a pain and had to get special 18mm socket. Had everything but in my toolbox! Nice product still.
Great fit, easy to install. Really like the fact they provide video installation and information about their products.
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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?