CURT 57674 Dual-Output 4-Way Flat Vehicle-Side to 7-Way RV Blade Trailer Wiring Adapter with r

My SUV already had the factory installed 4-way, but my new camper needed the 7 way. This was such a straight forward install. I was able to add a 7-way break controller. I can now haul with confidence.I had someone from u-haul perform the install, and even the technician recommended this Wiring Adapter.

I paid a little more since it had a built in tester and love that feature. I'm working with an older vehicle that doesn't have a simple plug and play wiring so, I went with this one so I can tell if everything is working. Works perfectly!

Power LED is always ON, this is a minor load for the battery. For this LED alone, it will take more than a year to drain a normal battery. But, it may give the idea to some smart a** to drain your battery by connecting something to the connector... but they can do it without a LED anyway, the issue can be solved with a switch and a relay so you control when there is power on the plug, the LED is not the issue, LED only shows that there is a flaw.The only real issue I have it that I did not find or I lost the instructions, and my existing plug was different, so here the wiring if you need it:- The 4 pin connector is obvious, it connects to the vehicle harness- White is ground, with the screw on connector, (standard colour)- Black is 12V charging power (standard colour)- Blue for Electric Brake (standard colour)- Yellow for backup (Yellow is standard for RV or SAE, while the traditional wiring colour code is purple as my existing plug)Other than that:- The yellow connectors are heavy duty, get some good crimpers.- If the vehicle doesn't have a 4 pins connector, install one, it will make your life easier in the future if you need to replace this plug, as I just did.

I am used to working on and around several sketchy trailers. They always bump into stuff, or the wires break, or for whatever reason not everything is functional on them. It is super useful to have something that is giving me a visual indication that the signals from the vehicle are at least getting to the back, so I can start my troubleshooting from there. If for some reason some of the lights aren't working, I can then pull my meter out and check the voltage right from the back to verify. I also installed a brake controller at the same time, and it was very easy to check that the brake controller was working. I did have to cut the four wire connector off that attaches to the one assumed to be in the vehicle because my truck previously had just a seven pin adapter, so I needed to crimp the pigtails together, and verify the factory colors on my vehicle were matching up with the new adapter. I immediately took the adapter on a 600 mi round trip towing a trailer, and everything worked like it's supposed to. A really nice option to have the flexibility to connect to seven pin or a 4-pin trailer without any additional equipment.

The only product out of the project that I'm actually happy with. The built in tester is nice, despite always having LEDs on. They are teeny tiny little lights, they won't kill your battery if you use the car with any real frequency but will save you a lot of headache when something isn't working. And if you're really that concerned about draining your battery; take the extra step to put a switch in somewhere (where you won't accidentally bump it while towing) to shut off the whole 7 way plug and brake controller.