[rdaystrom]

There's no need for an expensive voltage reducer in my opinion if your just adding lights. Just wire two 12 volt lights in a series and then wire them across three 8v batteries with an inline fuse of course.
I installed two 12v lights this way on mine and it works great. They run at normal 12v brightness and the wattage is only 100 watts. I understand that a large current draw on only half the batteries would possibly cause a charge imbalance. Two 50w bulbs is not a large draw on those batteries. In fact two 50w bulbs on those Trojans is like a mosquito. I suppose if I were drive hours at a time with full headlights I might need to rotate the batteries to negate any charge imbalance but I use my headlights a few minutes at a time.