2011mountian air. Chassis battery's go overnight with master switch turned off I can take 60 amp fuse out at the battery box an it is ok , house battery's are ok , what could could keep a ngative pull...
Chevy 454? This engine starter system is notorious for parasitic drain Sticky pitted contacts in the starter relay
I had two of them that would drain a new battery in 3 days A weak battery, that shows good voltage but no longer has full capacity Will drain in one night , IF this is your problem