[hunter1897]

My aft and middle bilge pumps don't seem to work except for when switched on at the helm.  I tested the aft float and it's toast so I bought a new one.  I did a continuity check on that float and it checks out so I know it's ready to wire in.  However, I can't seem to get any voltage from the two black wires coming to the float in the same wire loom as the brown and black wires which are coming from the helm switch.  I understand from the owner's manual that there is supposed to be a 15A in-line fuse on a 14 gauge brown / red wire coming from the port side battery switch.  The image in the owner's manual showing the battery switch and fuse looks nothing like what I've seen inside my boat.  Attached is the image from the owners manual, the image of my battery switches, and the wiring diagram.  Could it be that the previous owners had the electrical system replaced with something different?  Or am I looking in the wrong spot?  Or something else?