Any chance the connections at the pump. Either pump to ground or the hot wire are bad? You can test with a multimeter at the connections. Jayco crimp connections or notoriously bad. Don't trust the ground either as they have failed or were simply never tightened properly.
Or you got a bad pump motor. Before i bought one I would run a wire to the battery and try wiring it direct.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6