Q: Car battery is draining - 1984 Chevrolet K10

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I can’t get my batteries to hold a charge on my suburban 4x4 6.21 diesel. When I jumped started the truck it ran really good. And I used 2 separate battery chargers just in case. When it’s running the voltmeter shows 15 volts. But I can’t find anything turned on that I need to turn off that causing my batteries to drain. Do you have any idea what could be causing this?

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