Try removing the "AMP" fuse in the under hood fuse box and let it sit overnight see if the battery still drains. Have had issues with the staying powered up and killing batteries. If that doesn't work try again removing the "HVAC" fuse have also seen instances of the hvac module staying awake causing a high draw.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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