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Hello, I have a 1999 F250 Super Duty 7.3. I went out to start my truck and its completely dead, no lights nothing. I took the batteries out and checked them. They are completely dead. I bought new batteries, installed them, tested the alternator and battery both read in good range. Truck started and ran fine. Next morning came out and the battery is completely drained, no lights anything. Any recommendations on what may be doing this? thanks
 

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May have a shorted diode in the alternator.
 
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I should of told you that you can disconnect the large charge wire from the alternator and with the batteries charged let it sit overnight and see what happens.
 
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