discharge at full power

by Derald Graybill in General Tech Discussion 9 years ago

During a recent flight in my RV12 with a 912ULS I noticed a 2 amp discharge. I tried shutting different things down with no change. By the time I landed the voltage showed less than 12 and had to be charged before I could restart. On the next flight on startup I saw a six amp discharge that leveled off to five amp discharge at full power. I have removed the cowl and tested the voltage output at the battery and there wasn't an increase, only an amperage loss which I assume came from the avionics. I am wondering if the alternator has gone bad or possibly the Rectifier Regulator? Thoughts?

Re: discharge at full power

by Roger Lee » 9 years ago

Roger Lee

131 5.38k 5.44k

Since the RV12 has a high failure rate in VR's this is exactly what I would expect. I just don't see the factory stepping up to the plate on solving the problem. They did have one solution and that was to move it in under the instrument panel. Personally I would prefer some place it had air blowing over it, but the newer location may work. I know they have had some failures there too.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: discharge at full power

by Mike Miller » 9 years ago

Mike Miller

0 41 99

Yes you likely have a failed regulator.

The alternator/magneto is bulletproof, the regulator...not so much, these have design issues and the current version fails from vibration. Don't expect a solution from Rotax, they continue to blame the airframe manufacture.

Replace your regulator....and carry a spare, they seem to fail at the most inopportune time. I don't know of an RV-12 owner that hasn't replaced at least one.

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Re: discharge at full power

by David Bird » 9 years ago

David Bird

0 7 0

Iv had some issues with the charging systm on both 912 and 912, in different instalations. voltage spikes, dead reg/rec, CB trips, burned/ melted loom ends, and every time it was caised by loose conections on the yellow feed wires.

I replace the soft rotax connectors with harder ones to ensure good contact on those two terminals on every install as habit now.
Never had an issue since.

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Re: discharge at full power

by James Stricker » 9 years ago

James Stricker

18 95 113

See http://www.vansairforce.com/community/showthread.php?t=128499&highlight=john+deere

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