My dad just bought a 16" flatbed trailer. The problem the lighting works but not the brakes. The trailer has a 6-pin connector (i'm guessing common on any utility trailer) the truck has the 7-pin rv connector. I bought a hoppy adapter wish I would of bought a whole new cord instead. There's 2 wires coming from the brakes a red (***?) and red/brown(neg.?). Up front the red/brown has a yellow wire spliced into it which is grounded to the trailer. So the actual connector only has 5 wires going to it. The brake controller does work on my rv. I seriously don't think the wiring is right on the trailer. Seeing that the Kubota tractor we bought it with wasn't put together correctly also my dad won't be surprised. Anyone shed some light? Eric