I'm putting together a plane, and right now I'm working on the servos for the wing. The directions tell me to make sure that the servo arm is centered before connecting the pushrod to it. So, to do this, I connected the servo to the receiver, along with the battery. I made sure the battery was charged before doing this. I have a 7 channel, Tower Hobbies receiver. To be more specific.. a "System 3000". I'm using Futaba S3003 servos. I've plugged the servo into each of the channels, and none of them seem to work. My receiver is at 72.510 and so is my controller. the only thing that seems to be working is a trainer switch at the top right, and that just makes the servo glitch around a little, and does basically nothing. I have an older, Futaba FP-T5UAP controller... if that helps. I'd appreciate any input on how to make my servos center... and any other info would be very helpful.

P.S: I'm building a Mariner 40...