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In addition to G above:

All bilge pumps require the wiring to be spliced. If these connections are not made waterproof, they will corrode. Pump no work.

Remove the pump and wire it to the battery directly. If it works, it's the wiring. If not, its the pump.

On installing new or reinstalling the existing you can use heat shrink butt connectors like this:

https://shop.hamiltonmarine.com/produ...42938.html

or wire nuts dipped in liquid electrical tape like this:
https://shop.hamiltonmarine.com/produ...30888.html

You need to use marine tinned (12 or 14 gauge) wire to a switch with a 5 amp fuse.