need a diagram to wire a 6 flat trailer plug on truck with brakes.

6 flat? That's a pretty odd plug. Are you sure you aren't asking for a 7 way diagram? 6 flat pins around the outside and one round one in the middle?

just 6 flats all the way around.

just 6 flats all the way around.

FYRMAN was asking about the physical layout of the plug not the pins. I think this (http://www.accessconnect.com/trailer_wiring_diagram.htm)will help. It sounds like you don't have an auxilary power source on this plug/trailer.