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Hello, are any generator codes stored with the increase of charging system voltage? Why did you only replace the regulator and not the complete altenator assembly?How many miles are on the vehicle? No codes stored in any of the othe rmodules? Instrument cluster, pcm, etc?
Well if it is overcharging there is an issue with it I would think and the dealer recommended replacing it. Thats where I would start first for sure and see if the 15 volt issue is resolved
Diode trio dropping out would be suspect in the altenator cant hold field