I have an 07 e350 without the tow package. I found the factory 4 wires on the drivers frame rail, I also found the harness for my brake controller on the kick panel and hooked it up. I can't find the blue(brake) and red(battery) wires after the harness. Where did they go? Did they change colors?
Also where do I tap in for the purplr(reverse) wire? The tail lights?
I have 4 of my 7 pins working.

 

If you don't have a tow package, I don't know that you'll have the wires? You may bave to get a schematic and tap directly into the needed wires. I've only done f-150's. You might just need to tap directly into the brake switch and then wire a hot feed through your firewall to the battery(make sure it's fused)....

 

I have pluged into the kick panel connection and tested all the connection and they all work at the factory plug when the brake is applied. I have been looking for a wiring schematic that tells me the wire location and can't find one. Any ideas were to find one? I was trying to avoid running wire all the way down the frame rail to the dash if they were under the hood or on the frame rail, as to not double the work.
Thanks