Thanks for the info Big D, extremely helpful. My wife and I just bought our son's 2007 Ranger. He had a friend install an aftermarket audio system but it only worked with the lights on and lost presets when the lights were turned off. I pulled the unit out today and the truck wiring didn't match any of the diagrams until I found your information which appears to be exact. A little testing with the digital multi-meter tomorrow should get it fixed after I replace the blown 20A fuse for the battery feed.