the Electrical display keeps resetting itself while driving and it runs the battery dead when not in use.

i've been through two batteries, two months in a dealership, and several unnecessary repairs only to find i still have the same problem. what keeps kill my battery?the truck is no longer under warranty and a dealership still cannot find my problem. the truck sits for two or more days without be used and it kills my battery. the dealership has dismantled my truck but has not found the problem. they changed the steering control module but that did not turn out to be my problem.