The service tech's at my trusted dealer tested the draw of my "constant on" components and stated that the main drain (and what is killing my battery) is from the onstar module. Whether you have the service or not, the unit is always in atempts to stay connected to the provider. It is part of it's diagnostic service programing (and big brother control). While the signal is connected the draw is minimal but while searching, it is much greater. Unfortunatly by storing it in the garage (unless you have a glass roof or lots of windows on the right side) it can never connect, therefore a constant, greater draw of current and a more rapid battery kill. I was only getting 5 days of storage (any time of the year) and then needing a charge. I run a tender now.
DEEP, GT KIT,RK RAM AIR HOOD, DUAL WING, UP-SHIELD, EIB SPRNGS, DEJON CAI & I/C PIPES, CSTM EXHAUST,CSTM PAINT AND GRAPHICS, RMR STYLE BAR, LED AND ACCENT LIGHTS, CSTM GAUGE FACE, DASHHAWK, LAMBO DOORS, AVIC F700BT NAV, BONUS SUB & AMP, Prem. pkg w/leather, A/C, Auto, 18" chrome wheels, sport pedals, Backbone, Probeam, WERKS Tune.
"For those who fight for it, FREEDOM has a flavor the protected will never know"
Former WCKCC member. Now MKC member.