You will find all the wiring diagrams including the 940 instrument panel, in the technical pages/wiring diagrams...but you will need the members login and password. Also on the tech/FAQ pages there is a lot of detail on panel problems. I've had these symptoms on my 1993 960 instrument panel and I traced it down to the earth points down by either the pax or drivers footwell panel on the outboard side; and the earth points on the instrument panel. Clean them up and re-make them.
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