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Voltage will change depending on what you are doing. The alt is designed to dropout to help improve gas mileage. During the first 30 mintues or so of driving during accel you will run off the battery, on decel or coasting the alt will kick in and start to charge. After around 30 minutes it will stay constant at around 13.5 but will still vary based off driving. If you put your lights on the alt is always active.
This is what i have noticed with my daily drive anyway.
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