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Alternator circuit breaker opens when master switch turned on

- engine not running.
1. Shorted diode inside alternator.
2. Short in wiring between bus bar and alternator.

3. If you have intermittent circuit breaker popping you might try replacing that 30 year old circuit breaker.

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided is not intended to supercede or supplement the F.A.A. approved maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.