Hi Tamiya cowboy,
Yes trottle servo response to commands with the failsafe attached, i have a red light flashing meaning all is ok with the battery voltage. Solid red light means low voltage. My old failsafe was red black and white, new one is brown red orange its a GV 100 i think.
I go the set it by switching on transmitter and then receiver apply breaks and press the set button on the failsafe. When i go to test if it has worked by switching of my transmitter the throttle servo jumps to full open.
I will try to post vid later today.