So you found your tripped main coach battery 100 amp resettable breaker which is good. I was wondering if you were running the coach engine while you were using your jacks? Also make sure your coach batteries are fully charged.
Since you have a voltmeter it is good practice to occasionally check both coach and chassis batteries for full charge (12.65 volts unloaded) and also check them under various charging conditions....when on shore power only; when gen is running only and when engine is running only. You should see the same voltage on both battery strings after 5 minutes of charging if your battery control system is working correctly.....I assume that most coaches have some form of battery control.
Regarding the slide issue, engine should be off or the coach lockout relay will (or should) prevent the slides from working. Since you said the slide started to extend likely your engine was off OK. Did you notice one side of the slide moving more than the other (perhaps one motor not working?) before it quit? Slide controller alarms? Check the manual for reading alarms and resyncing motors.
__________________
|