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Your cart is empty.Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer's electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 4-way flat connector is designed to supply power for tail lights, turn signals and brake lights, as well as a ground connection. It features durable rubber-molded construction and is made with 60" of standard color-coded, bonded wire to easily splice into your vehicle's wiring system. This 4-way flat connector is a female-end socket, specifically designed for the car side of the connection. It is compatible with all 2-wire vehicle systems.
F. Nadine Rombakis
Reviewed in the United States on March 13, 2025
It's a replacement plug, what can I sat. It works!
bill proffitt
Reviewed in the United States on February 15, 2025
Good product
Mikey
Reviewed in the United States on August 30, 2024
nice heavy duty connector & wires
Client d'
Reviewed in Canada on August 25, 2024
Affordable and easy to install.
Cobra
Reviewed in Canada on August 15, 2024
Perfect fit for my trailer wiring, works like a charm.
Anton
Reviewed in the United States on July 12, 2024
This seems to be a very good quality harness. It is double insulated - the regular colored insulation and a clear insulation on top of that. Probably for UV protection, but I'm not sure.
67flatback
Reviewed in the United States on November 4, 2024
Nice and cheap
NC Bob
Reviewed in the United States on November 15, 2024
I used this connector with a mating one to carry 40 amps of 12v current, using the outside wires for ground and the inside ones for power. The only mild negative is that the wire ends were pre-stripped too deeply leaving only about half the copper wires. I cut them off there and re-stripped them.
xavier
Reviewed in the United States on October 7, 2024
The CURT 58040 Wiring Harness was just what I needed to make a custom wire adapter for my vehicle. It worked perfectly and made my project a breeze. Highly recommend!
frederic labre
Reviewed in Canada on July 16, 2019
Good
Aidan
Reviewed in the United States on November 1, 2019
Used this as replacement for the 4 pin connector on my '05 Ram 1500. The factory connector was so corroded the metal had turned green and brittle, never worked right at all. Cut the connector off, removed some of the tubing to get better access and stripped the wires. I stripped the wires on the CURT harness and used crimp butt connectors, I rather had soldered the connections but that is always a future option. I put clear heatshrink over each connection to keep water out then as extra protection wrapped the whole thing in a few layers tightly of electrical tape. Instead of letting the new connector hang under the hitch receiver and get destroyed again I ran it through the routing hole next to my license plate on the rear bumper. Looped up the excess wire and ziptied it incase I ever need a longer run of wire to a trailer. I used a zip tie just tight enough between the wires to hold the dust cover I cleaned and cut off from my old 4 pin connector. I did test each connection and everything works perfectly as it should, no more intermittent or non functional trailer lights. No more 7 pin to 4 pin adapter when my 4 pin should work just fine, now I have a brand new one. For price there is nothing better, may I add each wire has an extra layer of clear insulation around it, nice touch. You will want to buy the CURT dust cover made for this, I had forgotten to. I would say all 4 wires are about 16 gauge, on my factory wiring the 3 power wires are 16 gauge and the ground is a larger 14 gauge. I don't see any real issue with all 4 wires being 16 gauge, have had no issues, seems like quality copper or copper clad.
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