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Over voltage


ctfarmer

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Hi to all. I have been a long time away but great to be back with a passion.

I haven't been able to find much info on this problem. Flying today i noticed voltage climbing as high as 18V and seemed to more or less climb lineraly from ~12.5V to ~18 depending on engine revs.

I connected a meter across the battery and verified the Dynon values.

Removing the plug from the regulator and with batt master and gen push button switches on, both B and G terminals had full battery voltage of 12.7V on them. Turning off the battery master and gen switches, voltage initially read 12.7V but gradually reduced from 12.7 to zero presumably as the capacitor discharged. All good to my mind.

Ground between body of regulator and battery negative was fine.

Any thoughs? Regulator replacement time?

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That would absolutely be a faulty regulator, or faulty charge/sense wire.

The rotax manual has a drawing for the charging system. You need to find the wire that looks like a jumper, and make absolutely sure it is a clean, solid connection. If it is not, the regulator will keep the charging circuit closed and voltage will spike.

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