Originally Posted by Ed&Sue
All the lights pumps and slides work when the ignition is off.
First, I don't know your coach specifics. So, with coach battery disconnect "on"; engine and gen off and shore power disconnected from the coach.....any lights, slides work etc? If not, then as 16ACE27 suggested, you might have a dead coach battery string. Also you might have a 100 amp main breaker mounted on the wall next to (or near) the coach batteries that has tripped.....reset it if it is tripped. If it is tripped you wont be able to start gen or level your coach with jacks.
Do you hear the coach battery latching relay clunk on and off when you turn the coach disconnect switch on/off? If not, then I suspect it was latched in the "on" state and when you run the engine the alternator is powering your 12vdc systems through the "on" coach latching relay, through the 50 amp mini breaker to the converter fuse panel. The alternator should also be charging your coach battery. Put a voltmeter across your coach battery and fully charged is about 12.6 volts; discharged is about 11.9 vdc and charging from alternator over 14vdc.