i think your generator (not alternator) is working fine. 30.5Vac though is too much maybe you mean 30.5mV (milli volts) the generator is producing filtered ac voltage (half sine wave - produced from the rectifier).

IP= instrument panel

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i think your generator (not alternator) is working fine. 30.5Vac though is too much maybe you mean 30.5mV (milli volts) the generator is producing filtered ac voltage (half sine wave - produced from the rectifier).

IP= instrument panel