Most Popular Single-Function Adapter for 1999 BMW 3 Series

This product works as expected. There is not too much to the installation, just plug it in properly and mount the ground wire. I did not find an easy way to mount this to my wife's Odyssey, or to the trailer hitch (item# 75270). Luckily, I do prototype design and manufacturing. So I came up with my own solution. I designed and made my own bracket to mount the 7 pole to the trailer hitch. It works like a charm, and looks great!

this connector along with the short L bracket and the mount bracket- gave me a nice connector to my hitch. Though I used the short connector and did have to slightly bend it to allow the 4 to 7 pole connector to fit. If Id bought the long L bracket-- It could have worked-- but bending a little worked well.

This adapter worked exactly as described! I wanted to retain the original connector on my imported Land Rover Defender and this worked great.

Great build quality, but unfortunately it will not work to legally use a 4-pin trailer being towed by a 7-pin Euro/Land Rover plug. Its simply mapping 4 of the 7 pins to the following pins on the 4-pin side. Left running, Right running, Stop and negative, there is no provision for indicators or dual sided brake lights. It needs diodes (which it does not have) to do this. etrailer just needs to update the description as this is a good basis to make various adapters.

This adapter plugs in to the OEM receptacle without any excessive effort and the flat 4 pin connector on my utility trailer also plugs into the adapter without any excessive effort. As a bonus there is a cover for the 4 pin side of the adapter to protect it the elements when not in use.

I wanted one with a LED tester built into it to "trick" my SUV into thinking I had a trailer connected when really it was just a bike rack so the car didn't slam in it's brakes while reversing thinking it was something else. So I bought a different adapter. The picture slightly deceived me into thinking this had LED tester because the plug is attached by a rubber string (that I thought was a wire). So add another picture of the other side and that would eliminate my confusion. 4 stars because it probably works the way 99% of people would want to use it for.

My truck has a dual trailer connection - 4 pole flat and 7 pin RV. When using my utility trailer, the spring loaded door on the 4 pole side exerts pressure on the trailer plug and wire, causing it to bend severely. Thinking this would be bad for wiring longevity, I ordered this adapter, which goes into the 7 pin side, and the plastic, sturdy body of the plug takes the force of the spring loaded door without the door touching the wiring. Then, the 4 pole trailer plug simply plugs into the 7 way. No more stress on the trailer plug!!

High quality with nonoxiding metal parts. The extended length 4 pin connector makes hook ups a dream.

We are a U-Haul Dealer and bought this for use as a test device only. We need to test many vehicles trailer connections to be sure there are no issues before renting a trailer. Some vehicles have the trailer lighting connection mounted in a way that makes it impossible to see the lights on the testers. Of all the testers that are on the market, NOBODY makes one with the test LED's on BOTH sides of the unit. With the test LED's on the end of this unit you can always see them, regardless of the position the trailer socket is mounted! We have the same problem with the 4 pin testers. We purchased 2 different brands where one tester has the LED's on the top, the other has them on the bottom.

Your website led me to believe that this product could tell me whether the electric brake control on the tow vehicle works, without actually connecting the tow vehicle to a trailer. That is not the case, so I spent $20 on something I don't need.

I ordered this wiring kit for a 2003 Dodge Ram 1500 I recently acquired. The Ram was not tow ready but did have a factory 4-way. I also ordered hitch #13333. The wiring kit is very high quality and was easy to install. The 7-way fit perfectly where the factory 7-way would have gone. I'm using a Tekonsha Prodigy RF wireless brake controller so the blue lead was not needed but I left some extra should that change. Thanks etrailer!

Easy doing install and works great thank you