I checked the C terminal. Disconnecting it does eventually
kill the charging but not very quickly, so disconnecting
the C connection via a crowbar won't work.
At about 5000 rpm the C terminal was taking 0.04 A.
Not-a-lot !
Gilles - I notice you say that earthing the C terminal
will kill the output. But your own wiring diagram shows
that the C terminal is connected directly to a diode which
would not allow any current to run to earth from inside
the regulator ! So I suspect your "earthing" of the C
terminal was really just disconnecting it.
I replaced my original (intermittent fault) rectifier
today and it worked. So the replacement (which flicked the
ammeter needle between 1 - 10 amps 5 times a second over
5000 rpm) was faulty and it will be on its way back to the
supplier tomorrow !
I actually looked at the circuit board of my original (now
re-installed) regulator and saw three possible sites for
dry-joints. So I applied my soldering iron. The regulator
still works so I didn't bu**er it up; I will wait for a
few flights before I proclaim that I have fixed the
intermittent failure to charge !
Richard with positive engineering news about the
electrics. So now to continue to determine why the oil
thermostat doesn't work the way I expected.
G-OWWW High Cross
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