Trying to replace the pump cartridge on my Rule 700gph livewell pump. Seems pretty straight forward, just want to make sure I'm not missing something. I'm getting 12v from the brown and black wire from the switch. I did a quick touch of the matching wires on the pump to make sure it would run. I know not to run the pump dry for long, just wanted a quick connection to see the impeller move. The pump did nothing. Is there some safety on the pump that prevents it from running dry or did I get a bad pump?