The OEM (Cessna) alternator is 60 amp. But the aftermarket alternators from PlanePower or JASCO are 50 amp. Perhaps you have one of those? See if there's an STC for an alternator conversion in your plane's paperwork.
If I recall, the JASCO alternator can only be rebuilt by JASCO (they withold the parts and data). I don't know about PlanePower's rebuildability, but they use a Nippondenso alternator so I would *think* it's easily rebuilt.
-Kirk Wennerstrom
President, Cessna 150-152 Fly-In Foundation
1976 Cessna Cardinal RG N7556V
Hangar D1, Bridgeport, CT KBDR
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