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Looks like things have narrowed down. The EDC uses serial communications like RS-232/V.24 which has 3 modes. It works, it doesn't work and errors. If there were a problem in the wiring, 2 of these options would be available. Doesn't work means no compass detected and errors could mean the...

Installed the D100 a couple years ago. It hasn't been calibrated and using the Dynon harness. EFIS compass heading and OAT were fine during many hours of testing while building the panel until a few weeks ago. After a few minutes, the compass heading would jump from 128 deg to 278 and the OAT...