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Take the terminals off the discharged battery and charge it. Once charged, leave it disconnected and see if it will hold voltage. Once it does that hook it back up and then test hours or a day later.

Here is another video on the same theme:

The battery closest to the headlight on a stock CUCV is the battery that provides the 12 volts to run the basic Chevy stuff. Here is a video about it: I would suggest checking the voltage on both batteries separately. If they both have 12.6 or so volts then move onto the battery terminals and...