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Charge the batteries with the grounds disconnected and would be a good idea to have them tested for capacity
How old are they? possibly just died of old age, if the alternator is not charging good

There are a few scenarios that would explain your situation, but best to start with hot batteries first
 

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Be sure the doors are closed first -- there will be some current draw when first connecting the cable, but not much
this is because the electronics need to go into sleep mode, this takes a few minutes
if the door is open then the cab lights will pull some current

Best to test each battery out of the vehicle with an old fashioned load tester -- tho some of the new fangled testers work, I have seen mixed results
 
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