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OK Dave.
1. Was thew plug replaced on the signal conditioner?
2. Inspect the plug on the back of the instrument cluster, that does mean removing the plug and checking it.
3. Has your engineers got the proper test box for this system, if not it will make fault finding almost impossible.
I keep on about having a test box for this system, however you choose to ignore me, you cannot maintain the capacitance system without it. I have kept quiet for a while on this one as I just wanted to see what other owners do, and it does seem to me 'not a lot' perhaps you will listen now.
As regard the test box, Cessna made one years ago to cover all the aircraft with this system, this included all the connectors for the signal conditioners. Bendix did one as well and you could use the Cessna connecters.
Let me know how you get on
Pete
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