If the 100 amp fuse cks out, you might jump the (large) house battery disconnect solenoid terminals to verify (or not) that the solenoid contacts are OK. They can "click" or "hum" and even show battery voltage on the big lugs and still have too high a resistance to power anything more that a voltmeter. On my small rig, there is plenty of room to c a r e f u l l y jump the terminals/lugs with one conductor of a jumper cable set ...... for a quick test; but dunno about your coach.
Good luck with the trouble shooting; and, safe travels.
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Ed Sievers Denver, CO
Sold:2007 WBGO 31C Now:2020 Jayco 31UL
"Be the person you needed when you were younger"
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