I just bought a new 2007 Tundra. I occasionally tow a small utility trailer(4 wire, no trailer brakes). I received a converter for the factory wired Tundra, but I am unable to get tail lights(brown wire) to work on trailer(it seems as if no power is coming thru the brown wire from the truck).. Turn signals, flashers, and brake lights OK. Any thoughts?

Thanks, Jeff