[Tiara Open] Forward bilge wiring

[Mydiamond]

1996 33 Tiara Open.
My forward bilge stopped working
Replacing it - but I see one wire from bilge pump not connected.

There are only two wires from boat side - so no manual over- ride option?
Unit has internal float - standard three wires on the unit  (Rule 800)

Also where does the electrical line go to? Fuse behind helm?
Trying to chase back to power source…. And possible Manuel override.

Any input from the forum would be appreciated.
Thank you