I have a model 6509R that I just upgraded to recently. I got the 2 channel transmitter instead of the 4 because of availability. If someone has a pic handy of the channel 3 and 4 pinout with an existing 4 channel controller that would be helpful. Planning on adding my own switch I have here and I am pretty sure I know how to wire it up but would be nice to see how the stock on/off switch is wired in.