I have a 92 Fleetwood Jamboree - probably similar setup to 95 Fleetwood Tioga.
The emergency switch on the dash connects the chassis batteries to the coach batteries via a solenoid on the firewall of the engine compartment. That solenoid is a small silver device which normally acts as a battery isolator - it separates the chassis/coach batteries when the engine isn't running. When you turn on the ignition switch it energizes the solenoid connecting the two sets of batteries ... if your chassis battery is dead the "emergency" switch will connect the coach batteries to the chassis batteries allowing you to start the rig. Lots of threads on this forum on how to test whether that solenoid is functioning properly - use the forum search feature.
The relay on the radiator is something unique to ford - sounds like it needs to be replaced and that's the first thing I would do to see if your problem gets resolved. Once you know that's working then you can move on to determine whether you have issue with starter or starter relay.
Hope this helps.
