Bil2:
Not all rcvrs. are marked that way, especially the higher channel ones. Actually the batt can be plugged into any unused channel. The bus bar is just a generic name for a bar where many wires, all with the same purpose can be connected. It's two metal strips on the rcvr. circuit board right under where the plug pins are. I can learn something too. Don't know of any servos that have five wires What brand of radio system do you have ? The three wire systems are red wire is batt +. Black or brown wire is batt. -- and white or yellow is signal wire that tell the servo where to go.