CURT 57003 LED-Compatible 7-Way RV Blade Vehicle-Side Trailer Wiring Adapter

If you are trying to figure out why your Mercedes 2008 GL320 is giving you error messages when you connect to a trailer, the issue is the rear SAM (System Accesory Module circuit board) only being programmed to recognize incandescent bulbs for trailers.Rather than take your Mercedes in to be reprogrammed by the dealership, this tricks the rear SAM into believing you have incandescent bulbs on the trailer, and everything works perfectly! No more error messages on the dash!The odd thing is the rear SAM can only be programmed for with LED or Incandescent… if you tow more than one trailer, it would be ridiculous to reprogram your rear SAM every time.Use this adapter when you have a trailer with LED lights, and unplug when you have a trailer with incandescent.For the ease of use, price, and not having to go into the dealership, this is a perfect piece of kit to have in your Mercedes GL 320 or ML 320, and even a GL 450!

I have a 2021 Chevy 2500 Duramax and a 2021 Reflection (Grand Design) travel trailer that has LED lights.On our trip from Houston to Alaska, we started getting trailer break fault signals. After several stops to check that the trailer brakes still worked, we drove on trying to ignore the error messages. Multiple Chevy dealers checked out the truck and didn't find anything wrong until the Anchorage dealer mentioned the low resistance of the trailer LEDs might be causing the issue. He showed me a service bulletin about this adaptor and I purchased immediately Would highly recommend to anyone that deals with the persistent and annoying error.Also, keep your weight distribution hitch and ball greased up as well. If these systems are dry, it can multiply the trailer light warning messages

I have a 2021 Tiffin Wayfarer class c motor home with the Mercedes chassis. 3.0 diesel. I am towing a Jeep 2 dr JK sport and when I hooked up to the 7 pin it was not powering the lights on the tow vehicle. I took it to camping world and to Mercedes to see if something was wrong with the 7 pin. Mercedes said there is a tow module that tells the engine when something is hooked up to be towed but since my Jeep has LED lights there isn’t enough power from the Jeep to affect the module so I was not getting power for my Jeep taillights. I then called Tiffin and they suggested this adapter and just recieved it. Hooked it up and BOOM we have power. Problem solved for $30. Awesome and thanks.

This works great does what it's supposed. Easy to use at a reasonable price

Do not buy!!!! It is not a solution to fix the GMC-led trailer light problem. Nicely built. But doesn't work!!!!!!. 5 -negative Stars