If you disconnect the battery while the car is running your alternator will kick up to keep the car running. The regulator will then turn off output once you hook it up to a fully charged battery. I think your charging system is working properly, you seem to have a battery drain while the car is not running. Try disconnecting your battery at night and then reconnect it in the am and see if your car keeps starting ok in the am. If so then it is likely you have a drain to your battery. Search on the forum for battey drain and that should get you started. Good luck!
Brian

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Brian W. Heitman

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