I'm not sure I have a clear picture of how many fixtures your putting in. I'd guess four, each with a 25 W, 12 V bulb. I think the wiring would support that, but I'd check the voltage at the fuse and the fixture when the light's on to see how much of a voltage drop there is. That would give you a better idea how much current the circuit would support.
Of course, the CFLs would give you a lot more light for the lower wattage and less draw on the circuit.
Bob
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