I have a 1979 Ford Thunderbird that keeps draining car batteries. I have purchased a new Optima Battery (red top). And overnight the battery drained completely. I do Not have a stereo system connected, neither is the air conditioning connected. There are no electronics connected. The starter is working fine. I have a new solenoid. When the battery is drained, it will not start from another car giving it a jump but is will an electric powered professional battery charger on 'jump mode'. Does anyone have any idea what could be draining my batteries?
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