02 express lt fully loaded

Two months 3 dead batteries?
Yes I replaced with ACDelco #78-7yr as per manual
New battery drove to Tahoe van sat for a week in the snow temp 5 and below started right up got home sat for 2 days; dead battery.
New battery sat for four days drove again to tahoe sat in snow for week got home week later; dead battery.
Chevy Service said no problems. New battery drove for two weeks no problem sat for four days dead battery.
Will sit with deaqd battery til I figure this out.
HELP:banghead::banghead::banghead:

Check charging system and all connections and grounds and battery and battery cables.
If OK and it is going dead after sitting 2-3 days.

Get someone to run a amp draw check on your electrical system.

Over 0.260 is way too much-that's 260 milliamps-should be no more than 25 milliamps or 0.025 amps.

Two months 3 dead batteries?
Yes I replaced with ACDelco #78-7yr as per manual
New battery drove to Tahoe van sat for a week in the snow temp 5 and below started right up got home sat for 2 days; dead battery.
New battery sat for four days drove again to tahoe sat in snow for week got home week later; dead battery.
Chevy Service said no problems. New battery drove for two weeks no problem sat for four days dead battery.
Will sit with deaqd battery til I figure this out.
HELP:banghead::banghead::banghead:

:):):):) 2/25/09 Problem solved; The vanity light inside the over head visor had a fault and was remaining on; could not be seen because the vanity has a cover over light & mirror. Disconnected the light; who needs it anyway have plenty of positional lights in van.

Glad you found it.
A amp draw test would have told you something was on.