Our (new to us) 2003 Coachmen with 7 thousand miles on it has been idle for most of its previous life. It had been stored properly and bringing various systems back to life has been fairly straight forward.
The issue we are dealing with at the moment involves the cab radio.
It does not function properly from the ignition switch. It will work fine when the Coach power switch is on and the ignition switch is off, but it will not work from the ignition when the Coach power is off, i.e. normal vehicular mode.
The fuses have been checked and I pulled the radio itself to verify that there are no loose wires. I suspect there is a relay to isolate the two systems…have not been able to locate that.
A wiring diagram as to how Coachmen modified the Ford E450 radio harness would be handy.