Normally most steps work off the Chassis batteries...so you can drive/move the coach without connecting the house batteries.
To be sure, use your disconnect switch (one at a time) to confirm.
Are you using a 12Ga (were you using a 12Ga) cord??
First thing to do is pulg in shore power, and meassure the voltage on house AND chassis batteries.
13.2-13.8v is a flaot charge voltage. 14.2V or so is a charge voltage.
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2014 Jeep Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -South Orange County Ca.