Alan,
The last page of this factory link has a basic wiring diagram.
http://www.europa-aircraft.co.uk/upload/CBM%20-%2025%20-%20ELECTRICAL%20SYSTEM.pdf
It sounds like your Europa may be wired similar to this. You certainly have the
optional battery isolator (master relay). What isn't clear is how your
voltmeter
is connected. By this diagram your voltmeter would indicate only if the
master is ON and the instruments CB is ON.
When you have the Master OFF and the Gen ON, there is no 12v for the Ducatti
regulator/rectifier.
Lead C of the Ducatti needs 12V to operate the internal electrical
circuitry and also to sense the system voltage. Without it, I'm not
sure what the indication would be.
As stated before, at 2000 rpm the voltage will be low. The Rotax is NOT an
alternator,
it is a DYNMO. It's output voltage is dependent on the engine rpm and
it is quite low until the rpm is above at least 4000. 5000 rpm is better.
Surely a LAA inspector can help you determine how your Europa is wired and what
the problem is.
There may be no problem, you just need to operate at 5000 rpm. As Brian pointed
out, be sure there is a good ground connection from the case of the Ducatti
to the aircraft ground. Also be sure all the ground connections are secure,
especially
---From the battery to the engine and to the system ground.
Jim Butcher
N241BW
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