I had posted a few months back about replacing my alternator on a 89 Cat 30 with a Universal M25XP engine. I did purchase locally a 72 amp Leece-Neville marine alternator, and had the shop modify it for external regulation. I also purchased a Balmar MC-612-H Max Charge regulator. Now that the skis are stored, and my trip to the BVI's is booked for April 08, it is now time to start thinking about how to install these two items. When I pulled the original alternator (Motorola 51 amp) I noted only 4 wires. There was a black, which I find strange that was connected to the + pos output, an A.C. Tap and two additional wires which are not marked on the back of the alternator. I would guess that one is the Sense and the other the exciter. The new alternator has the following: Ground, Field, Batt Pos and Aux. Where do I start? I have not even gotten to the Balmar Regulator. I need help, or I will be at the mercy of my yard. I pride myself on doing my own work, but this time I might have gotten in over my head. Any help would be appreciated.One other question; I cannot gain enough clearance in front of the engine to remove and replace the alternator belt. The only way to get the belt off seems to be to cut a notch in the fiberglass under the engine access panel.