I had similar problem with my Fleetwood - I got frustrated and just installed a wire running from my radio fuse (only operates with ignition switch on) to the solenoid. Any auto parts house will show you how to put a second wire/jumper on that fuse. In my rig the fuse was located inside the rig and I ran the wire through one of the grommets on the fire wall to the engine compartment where my solenoid was located. Might have been other solutions but this one worked and has been working for the past 7 years. Just a thought.
