Also if you have a plug where you can disconnect it and its not hard wired, you can disconnect it and turn it on, if it dont trip then yeah the motor is bad or going bad. If it still trips, then you got a wire shorted somewhere
Most likely pump has gone bad. I had the same issue. I had good continuity with no shorts on all wiring. I replaced the pump cartridge with one from Amazon and all is good. Search "Replace bilge/livewell pump" on YouTube. Easy fix once you remove the bilge cover in the rear compartment.