Have Boat Questions? Ask a Boat Repair Expert.
Hi, my name is Kerry
Most bilge pumps have a float switch connected directly to the battery bypassing the switch on the dash.
This is done so that the pump works when the bilge fills with water even if you aren't there.
The float switch is stuck on, it may be no good, or it may have some junk holding it up.
The cartridge is probably the float switch.