A new wrinkle popped up while trying to test an interface idea between an rc receiver and power chair joystick control. Pin 8 is a switch output that's not connected unless there is a switch. Since the power chair has a feature that locks/unlocks the wheels to the motors and throws an error (flashing power lights) when wheels are disengaged I'm guessing that's the switch. The switch (if there) should be connected between pin 1 (+v) and pin 8 (switch output). So with the switch in the error state (open or closed, don't know) pin 8 would be ???