Thanks for all the tips and advice, gang. Keep 'em coming!
So, I decided to let the battery charger sit overnight. The batteries then charged up to about 12.6. I disconnected and went for a 30-mile drive; batteries went up to 12.8-ish. I then turned off everything and let them sit. They have now been sitting with no SP or anything else and the latest reading at 5 tonight was 12.51. Apparently, they were so discharged that they weren't able to be recharged using the SP.(?) Does anyone have a theory on why that would be?
Either way, we might be good to go. I'll tell my service department about this issue when I take it in in 10 days for an unrelated fix and see what they say.
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