I stored my car for months on end and occasionally the battery would be low. Im wondering if the CD changer is always "hot" in the trunk. Seems every time I open the trunk the CD changer is lit up like its waiting for me to load up some tunes. The parasitic loss to the battery is probably minimal but thats the only thing I can think of that could be draining the battery as everything else is turned off short of the radio memory. Does the trunk light switch activate the power to the changer?