Re: Alt Field Circuit Breaker Popping

Rick Hole

The 50/60a breaker protects you from shorted diodes and disconnects the alternator output from the main power bus. The 5a breaker disconnects voltage to the regulator and alternator field. 
If the 5a trips try disconnecting the wire to alternator field. Still trips: you have a bad regulator or wire fault. No trip: alternator problem. 
59/60a trips suggests bad alternator or wire fault between breaker and alternator. 
As you bench tested the alternator, the regulator and it’s wires are more likely the problem. 

Rick Hole
Retired from Velocity

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