Originally Posted by Rodneh
You need the power box or you have to construct something similar. Put the servo bus (both positive and negative leads) on a separate bus and disconnect the positive servo leads from the receiver and connect them to the servo bus. You still need the signal leads and ground leads from the receiver to the servos. i.e. the servo bus ground lead and the receiver ground leads must be connected together.
Do you have a schematic of this arrangement?