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Re: battery or alternator???
Why do you feel you have a problem? Is your battery going dead? Voltage out of the alternator will vary based on engine speed and also current draw as determined by the ELD, so I would expect some changes. The only thing that can be said for sure is that the alternator should put out about 14.5 volts when the engine is running above 2000 RPM and when the battery needs charging.
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