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Charging systems today are different from systems of the past. If your battery is fully charged the alternator will not continually charge the battery to 14.4. The system is constantly monitoring the charge state and health of the battery and maintaining a charge when needed. It is not...

Where was the buzzing noise coming from that you described? That does not seem normal to me. Also, did you only disconnect the main battery for 15 minutes until the sound stopped? Or both batteries? If you oniy disconnected the main battery then the source of the “buzzing” sound could have...