ThatGuy007:
I think there has been a misunderstanding. I am fully aware there are three pins, +5v, signal and gnd. What i am asking is do i use the same signal wire, which for this hypothetical question is pin 4, at the base of the npn transistor? The servo will have a decent load, so i am sure that i need a transistor.
Your are incorrect, the servo control input pin is just a logic signal input that draws almost no current. The working current comes from the +5vdc power wire of the servo.