Hi John,
I did some digging in the 400W series installation manual. Its pretty heavy reading, but if you look at fig. H-31 it has the complete wiring diagram to allow the 400W/420W/430W to interconnect with the autopilot.
I have the 400A autopilot as well, it works a treat. I plan on upgrading my (very old) radios at some point, so I was hoping someone would jump in here with more info.
I'd be curious to hear what the avionics boys have to add, and to learn more about it. Heres hoping its not too difficult/spendy.
Leighton.
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