Originally Posted by seaosrover

I just recently wired my disco for my trailer. You can get an adapter to take your 7 way round pin to a 4 way flat. Then get the 7 way flat pin recepticle to mount on your bumper that also has a plug in the back for a four way flat. Plug in the 4 way flat and you will have all of your lighting taken care of. You will then have to wire the brake control yourself. About 8 to 10 inches from your battery mount a 30 amp breaker to the firewall. Run a small length of 10 guage wire to the breaker then run a length of 10 guage wire from the other side of the breaker and another to the ground on your battery. Run both of these to your brake controller in the cab. There is a wire from the brake controller that needs to be connected to the wire on your brake pedal switch. The switch is very easy to take off its mount. One half turn and it will disengage and you will be able to pull it down low enough to get to the two wires on the switch. Use a circuit tester to find the wire that is hot when the switch is in the out position. If you have the tester on the wire you can than work the switch and when the switch is pushed in it will not have any current present. Connect to that wire. Than run a 10 guage wire from the blue brake wire from your controller back out of the firewall and back to the blue wire on your 7 way connector on your bumper. You now have brakes. You can have this done at an RV dealer but it really is pretty easy to do yourself. If you can find an adapter to go from the 7 way round to 7way flat you still will have to wire the brake controller. Happy Camping!!!! I will check back on this post to see if you have any questions or just send me a PM