Why does my tricks voltage is fluctuating from 14 volts to 12.6 volts up and down

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. On modern vehicles like your Silverado, the alternator is designed to adjust its output based on the vehicle's electrical load and battery state. The alternator may be cycling between charging modes, which can cause these voltage changes. If this fluctuation occurs more noticeably under load (when you're using more electrical accessories), it could be a sign that the alternator is struggling to keep up, or there may be an issue with the voltage regulator. If the problem persists or worsens, it might be worth having the charging system tested to ensure everything is functioning correctly. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!