2 to 1 tail light conversion module

I use this from eTrailer. I used it in 2 vehicles that had amber turns. I installed this after installing LEDs in my first vehicle, that totally messed up everything with another converter in place (probably what you're going through). Then, when I got my 2nd vehicle, I put LEDs in it right away, and got this coverter again for the trailer. You can see my review on it, too, on etrailer.com (Matt M).

http://www.etrailer.com/Wiring/Tow-Ready/119190KIT.html