The Garmin GFC 500 installation manual calls for an autopilot circuit breaker and a separate trim circuit breaker — just like my old KAP 150. The original TRIM  breaker was an ETA rocker breaker/switch which I retained with the GFC 500 installation figuring it was easy to reach in case of a trim runaway. Today I did a test. I turned off the TRIM breaker with the GFC in ALT and pulled the throttle back. As the airplane slowed, I expected to get a TRIM UP annunciation on the G3X as one would get w