I run a pump off some solar panels that both run the pump and charge the battery to run it at night (I hope it's charging the battery). I have run into some issues where the recharge rate was not adequate and sucking air and losing prime so I connected wires and plates (+,-) to the bottom of the pump so the pump only ran when covered in water (copied off a bilge pump design)...which fixed the problem...so it constantly stops and starts but does not lose prime. But now for some reason it is still stopping and starting but it will only run properly if I earth the positive connection...only found out when trying to sort out the problem and touched the positive connection... So can't work out why this makes it work or why it is still starting and stopping and not running all the time and sucking dry. My knowledge is quite rudimentary. Any advice appreciated.