Have the charging system checked. Autozone, Advance, and Oreilys will do it free. Check Diodes.
Some production years had a weird problem. Its worthy of mention but since you replaced the batteries, it should not apply. Watch your Charge, Voltmeter as sometimes the Alternator will disconnect automatically WHILE DRIVING at even 70mph. The system monitors your vehicle for PARASITIC drains and automatically disconnects the power connection as part of a Battery Saver.
So if Battery levels fall, causing the Alternator to work too hard to recharge a drained system, it will disconnect the charging circuit. Even if if you used a boost to jump the truck, it will charge for maybe 5 minutes and then disconnect.
Now for the battery to drain in 1 hour, you should have a glowing part. About the only thing which could drain that much power is a Rear window defroster or a stuck timer or power relay on the glowplug system.
The glowplugs could be remaining energized and you would not know it. A grounding starter could drain the system. Have a draw test performed.
Most anything else would break a fuse or burn a wiring connection.
Clean the Negative battery cable and if mounted to the block, check the engine to frame strap.
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SOURCE: car wont start, acts like
Check the battery +12v power connection to the starter is in good order,
Check the ground connection between the battery negative and the engine/starter motor is robust and intact.
If no problem with above, replace the starter motor.
SOURCE: battery dead this morning...just got
More then likely a bad cell in the battery, so it won't hold a charge, jump it and go to any auto parts, they will check the battery and alternator for free, I don't think it's the alternator, due to you drove it for 40 min with no trouble, if it was the alternator, the car would have turn off on you while driving it.Most of these auto parts will also install the battery for you for free.
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