Look on the back wall of the livewells, there should be two small 1/2″ CPVC Caps with slots in them. Those should be injecting freshwater through those caps. The pump will be in the rear sump, and directly out the rear wall around the boats drain. That would be on when the pump is switched on. You can rotate cartridges or check for a wire pulled loose. Those are small bullet connectors with 6″ stub lead from the motor itself. The voltage is on a circuit breaker, and you can check at the pump and out the back of that panel. BCB