Heres my setup

SCRT10, mamba max pro, novak 4.5 550 motor. Red and black power wires from Hitec 7940 servo plug directly into a lipo hump pack (yellow signal wire plugs into rx). Internal BEC on the esc plugs into the rx and powers the rx and transponder

I couldnt get my 7940 servo to run off my lipo rx pack - do i have to put the power from my lipo hump pack through a bec before it goes to the red and black servo wires?