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Yeah just disconnect the 5v line from the arduino and wire your higher voltage just to the servo power lines. You will still need ground from the servo tied to ground on the arduino. Fyi, not all servos can handle more voltage so check specs first. Also, if you want to be extra cautious you can use an optocoupler between the servo and arduino for insurance, but this isn't necessary.

If you want a schematic of the wiring, Google "wiring high voltage servos" and some rc websites pop up with good images.