If you have LCI jacks, go under your motorhome and check the ground cable from the pump motor to the frame. The common failure point is the ring terminal where it bolts to the frame. The break may be concealed by insulation.
Several of us have experienced this failure. It's an easy fix.
Thanks to all that responded. This was my first go at the forum. Crawled under the rig when it got light and sure thing the ground cable hanging down. Twenty four inch cable flopping when a eight inch cable would work. No wonder the end broke off.