When I first bought my Suburban a year ago, the battery would go dead on me without warning. Had the battery and charging system tested at Autozone. Battery was going bad, so I put a new battery in it.
If the battery and charging system check out ok, then you will next need to check for some parasitic draw.
A forum community dedicated to all General Motors truck owners and enthusiasts. Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more!