Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2002 GMC Envoy
These items fit your vehicle
2002 GMC Envoy
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Trailer wiring problems can cause big headaches if they affect your vehicle’s electrical system. This harness uses a powered converter that takes power directly from the battery instead of the vehicle’s light circuits. If a short happens on the trailer, it won’t knock out the vehicle lights or damage its wiring. The converter also combines separate turn and brake signals so your trailer lights work just like they should.
You don’t have to cut into the factory wiring to get towing lights. The harness plugs into existing connectors behind the rear panels, using matching plugs for each side. Just disconnect the taillight plugs, snap in the Curt connectors, and route the harness to the converter box. The 4-flat connector comes ready to use for running, turn, and brake lights.
The included black power wire runs from the back of the vehicle to the positive post on the battery. This direct feed keeps trailer voltage separate from sensitive factory circuits. It also makes sure the harness gets consistent power for all lighting functions. The fuse holder at the battery adds extra protection against overloads or shorts during use.
Grounding can be confusing on some installs, but this harness keeps it straightforward. The white ground wires are already built into each connector and tie into the factory taillight grounding points, so no extra mounting or drilling is needed. Once everything is plugged in, the grounds are complete and ready to go.
The 4-way flat plug gives you all the standard lighting functions—running lights, left and right turn signals, and brake lights—so any basic trailer can be connected without extra adapters. It’s a clean, reliable setup that works for most light-duty towing needs.
Customer Satisfaction Score:
87% were satisfied with this product
13% of customers were not satisfied
Ratings & Reviews
Carole
10/8/2023
To update: after a year, it’s still meeting and exceeding my expectations. Thanks again!
Andrew N.
10/24/2023
Lazer S.
4/28/2026
Sorry to hear it's not working properly, Lawrence. Couple things to check. First, make sure everything is plugged in all the way and fully seated/snapped together. Second, make sure your ground is on a good clean metal surface that is not aluminum. I would also make it has its own ground source and isn't stacked with other grounds. I honestly think you are having a grounding issue as almost 100% of the time we hear something weird happening, that's the cause. I would say what you are experiencing is also weird. Let me know if either of those fixes your issue.
R.p. R.
4/29/2021
Great-just what I needed and wanted
Dale
5/6/2022
It is working perfectly!
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Kcr
11/19/2023
Still faultless.