Originally Posted by mmwjr
What shrew said was only only way a shore power issue could effect the 12V system is if a surge passed through the battery charger.
I'm not sure I went even that far (RE: Passed Through)
1) Power stanchion was tripped
At this point, if there was a 12v draw on the boat (e.g. fan, electronic (sensing) bilge pump, fridge) we can assume there is a chance the active battery is dead.
2) Power stanchion was turned back on
3) Still No 12v on boat.
Even with a dead battery, If the battery charger is getting AC and pushing DC, then the 12v systems on the boat should work.
The battery switch is on?
I would try switching batteries
I would put a volt meter on the DC output of battery charger itself.