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Sorry to be so long in getting back to you.
If you have two bulbs, each is going to require power. Now, you already have one power wire and a ground. All you need to add is another power wire leading from your breaker panel to the mast step. Add a breaker to the panel to switch and protect the circuit. Two additional power wires means you need two empty spaces on the panel. If this method proves to be too difficult, you could consider adding a pair of breakers at the existing terminal panel at the mast. Then the existing wiring will become a feed for both lights. Since you have two two bulb systems that you are feeding, you will wind up with four breakers at the mast.
If you have called the manufacturer, he probably has told you that black and red are probably power and white is ground. The blk, wht, and grn wires are probably standard 110vac cable, and the person used it because its what he had. It will work fine, but you make up your own color code. I always use green for ground, white for anchor, and black for tricolor. That is assuming of course that it goes to the top of the mast. If it goes to the deck light/steaming light, green is probably ground, but after that, you are on your on. Check out the color codes used in the rest of the boat. Whoever did it, probably used the same code throughout.
A meter will show you which of the boat wires is positive and which is negative.
I am curious, have you ascertained if you have multiple bulb fixtures on your mast? When you flip the switches on, do you have any lights showing?
Hope all this helps you.