I saw some '99's with the pump installed in the BOTTOM OF THE BILGE near the driveshaft. Gotta wonder what they were puffin on when they decided to do that. If yours is like that, you want to upgrade anyway. The fix was to move the pump into the storage compartment, left side looking in, on the back side of that panel. There were wiring changes as well. Evaluate what you have and we'll all chime in on what the best way to fix what you got or rip it out and start over.
You will LIKE the way your boat makes wake with a working ballast system!!