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I'd maybe look around to see what system would have been added at the factory for that year to see what options would have been available for additional ballast. I'm not sure if at that point they would have used either a series of 3 solenoids to distribute water from your existing pump (like mine) or if it had 3 separate pumps for each ballast zone. With that info, it wouldn't surprise me that the wiring is there for the switches, solenoids, etc as they could have used a standard wiring harness for that model of boats at the time. They could just add or subtract depending on the options chosen by the dealer/buyer. I've seen this before with past vehicles where the trailer wiring was in place, but tucked away and all I had to do was add some fuses and dig the wires out. I'd definitely have a look under that panel below the throttle to see if there's any unused connectors ready for switches, look at the fuse block under the helm to see if there's wiring to it for the ballast zones (my fuse block was labeled), and also check at the back of the lockers on each side of your engine to see if there's wires run there (my wires run along with other wires kinda behind/above the rub rail) that would be used to power the drain pumps (like the yellow one shown above). If you do have the wiring in place, it may just take some time trace what's what using a volt meter and then plan it out. It's all a fun mystery to figure out. If nothing else, you get to know your boat more intimately. Looking forward to reading about your findings.