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Well, I don’t even know where the common ground is on my own coach and I would hate to have to look for it as well. There is a stripped chassis builders document that Ford puts out for each year that is used by Thor to electrically tie into the Ford chassis components. My guess is that the front end light systems would probably be done via a wiring harness which then uses connectors at the various end devices (turn lights, head lights etc.). Since you have lost all these systems in the front, the “common ground” is a likely suspect. The other possibility is a main harness feeder connector that has come loose or separated. So my guess is start looking on the driver side (because it is close to the dashboard electrical items like light flasher module; harness feeder cabling etc.). If you can get into the brake master cylinder area visually look around the firewall or chassis frame for a bolt with an obvious larger gauge wire under it......or if the bolt is now gone, a larger gauge wire terminated with a bare ring connector that is hanging loose. Also check that any wiring harness connectors near the firewall are solidly connected together. Good luck in your search.
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