Have you checked the simple things? Fuses, circuit breakers, wire connections? A basic circuit tester that is a light up probe, a wire, and a clip will help out tremendously when checking connections
Agree with Drago, start simple. Check power to the float switch and the pump, if you use the shower, it also may be clogged with soap residue. Both parts can be cleaned and start working again. That is if you have power to the float switch and the pump. If the switch or pump has failed replace both.
I have checked all the wires coming into the bilge with two different testers and no power in the bilge art all. Wondering if there is a breaker or fuse inline . I checked the breakers in the engine compartment and none correspond to the forward bilge pump or the shower sump.