Hey guys I have this single axis gimbal Single-axis Camera Gimbal Camera Mount Carbon Fiber with Servo for Multicopter Bumblebee $43.75 Free Shipping @GoodLuckBuy.com and I was told that I needed a BEC to power the servo. I know that the signal wire connects to the pixhawk and it also has a place for a ground wire. But should I run both the ground and the positive wire from the BEC to the servo or just the positive wire?