I had strange problem and finally fixed. Last night all was working fine, but when I woke up, I had no water. I went crazy looking at all fuses and panel, but still no power to water pump. Finally, I ...
I think, that I found the problem. Any time the voltage overnite drop below 12V ( using heater) the pump turn off. Today the voltage stay above 12v and pump is working. I have no idea why, it could be some kind of sensor to prevent pump from overdrawing the battery.