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alternator failures

Yahoo Message Number: 94320
1996 magna #5322 detroit series 40 Alternator just failed for the 3rd time in 2 years. Each time alternator removed, bench tested to confirm failure, rebuilt, bench tested and worked fine initially. The failures always start with the tach working intermittent. Have checked all connections at alternator and battery isolator. The voltage gage in dash has always registered low voltage so I don't know if it could be involved. John