Alkaline batteries cannot supply enough amperage to high torque servos. Upgrading to a rechargable battery would be a good idea. Also AM receivers have a BEC circuit in their designated battery slot so that will need to be bypassed. To do this simply plug the battery/ switch harness into a open channel on the receiver. If all your channels are being used then use a "Y" harness to connect the servo and battery/ switch into a channel.