[Gunner]

Within the normal range of alternators (50-100 amps or so) there should be no problem as long as the wiring matches up. All the VR does is cut the alternator in and out of the circuit as needed to maintain the voltage and the battery charging. The rating of the alternator only means that it can pump out more amps to feed stuff without having the voltage pulled down.

When you're powering a flashlight, it doesn't matter whether you do it from two D cells or a whole bank of Optimas.

When you start to get into truck systems and the overpowered stuff in boom cars, it's different. But the stock stuff all works pretty much the same way and to the same limits.