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Thanks for the replay. I can put an airport or other waypoint into either the Chelton or 530 and put the Sorcerer into GPSS mode and everything is fine. There is a switch on the panel to change between the Chelton and Garmin units. This seems to work fine. However setting up a standard instrument approach on either unit seems fine to the initial fix point, then the plane will turn to what seems a totally random direction and I have to hand fly the approach. The shop which did the install closed up before I bought the plane from the original builder and all the wiring diagrams went to some dump (sad!). I recently had to pull on of the Cheltons to clean the contacts from the internal hard drive so I used the opportunity to use an ohm meter to trace some of the wiring. Both the Chelton and Garmin have the ARINC 429 lines going straight to the Sorcerer, but neither the Chelton or Garmin units seem to have their RS232 lines going to the Sorcerer. The RS232 pins are connected to something on both units, but do not seem to go to the autopilot. I can't figure out what the panel switch for selecting the Chelton vs the Garmin units is actual switching. I seem to remember that on an instrument approach something changes to get tighter navigation...
Late reply and you have likely solved the problem by now, but one heads up: In switching between my GNC355 and Cheltons you must release lateral steering on the a/p, thus going into track mode prior to making the switch from or to the Cheltons. You then put a/p back to LS/VS. Realizing assumptions can be dangerous: I am assuming that is true on the Sorcerer as well as my Digiflight II VSGV. I'd be curious if/how you have solved.
