No electric in rig - although plugged in - bad batteries.

While you've got your meter out, switch it over to AC, set the scale to something above 120VAC and check the 15/20A plug at the pedestal. If it's powered up, plug in your 15-30A adapter and check its output; again, if its powered up, plug in your 30-50A adapter and check once more - if you've still got somewhere around 120VAC at the output of your 50A adapter, then you know you've got power at least up to your shore power cord. Then it's just a matter of following it in to your breaker panel.