The existing charge controller got fried due to a design condition having to do with loosing battery power when the sensor and charge wires are touching. I decided to replace the controller with one which does not have such an issues/trap. The new controller is from xantrex – the same brand as the inverter/shore-charger.
The fuse went on the waste (black) water pump. Replaced the fuse and it went again. I could do a rebuild on the pump but I decided to simply replace the pump.