Check your house batteries with a meter.
With shore power or generator power the meter should read either about 13.4 v or 14.4 v depending on state of charge of the battery. If it does not, then charger is likely not working.
As said above, check your house battery shut off switch to be sure it is on.
Check your battery without external power source. It should read between 12.0 and 12.6 v to have enough charge to run things. If it does not then the charger or batteries are suspect.
I would assume the alternator is ok since you drove the rig home. Many rigs alternator also charges the house batteries with priority to chassis batteries.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs