Voltage Regulator Tripping
Last September we replaced the old dynamo on our Continental 0-200 with a new alternator, a voltage regulator and a new battery. After this change, we flew the aircraft for about 5 hours with no problems and then started to have problems with the overvoltage trip.
Most times, the overvoltage tripped about 2 minutes after engine start. Occasionally it would reset and work OK for the following flight. Mostly it would trip again after reset.
We have monitored the voltage across the battery and, after start, it steadily rises from 13.4V to about 16.5V when it trips. Loading the battery with, say, a landing light, delays the trip.
After extensive voltage monitoring we were convinced that the voltage regulator was faulty and we were supplied with a new replacement. This was fitted at the w/e and intially worked properly, with the voltage remaining stable during a 10 minute taxying test.
However, 10 minutes into the first flight, the overvoltage tripped again.
We are now baffled and don't know what to do next. We have a qualified electronics engineer in our group and he has done most of the testing so we are satisfied that connections and the wiring are correct.
We would be grateful if anyone out there can suggest any further checks we can do. The alternator and regulator were supplied by B and C. Has anyone else had similar problems with B and C regulators?