| Your alternator should be running between 13.5 and 18 volts you can put a meter on the battery while the truck is running and check the voltage. If it is not charging properly your batteries will not charge completely. So when you let it set with Acessories running you kill the batteries.You can also check the gauge on the dash make sure it is a Little after the center mark. If it is I would start looking at the wiring between the alternator and the battery.
__________________ 06 2500 CREW CAB 4X4 LBZ
4" DIAMOND EYE EXHAUST, KITTY RAN OFF!!!
DIABLO @ 120HP. 285/75 BFG's RUNNIN ON ULTRA 16's
PIONEER HEAD UNIT RUNNIN SCOSCHE AMP W MTX TWINS
AIR BOX IMPELLER REMOVED!! RESONATOR PLUGGED !!!
AUTOMETER ULTRALITE GAUGES IN POD. TRANSGO JR 
SOME OTHER EXTERIOR GOODIES AS WELL WORK RIG (theirs but mine)
O7.5 3500 CREW, LMM, ROYAL UTILITY BED
4" DIAMOND EYE EXHAUST.DPF???KITTY?? QUADZILLA PROGRAMMER. MTX AMP AND 10" TWINS IN THE BACK. STEPS,VISORS,BUG SHEILD. AIRBOX IMPELLER REMOVED,RESONATOR PLUGGED,LOTS OF PRETTY DIAMOND PLATE EVERYWHERE  |