I have a 2008 Micro Bird on a Chevy Express chassis that is running the batteries down after sitting for a 3-4 days. This bus has a weird quirk that it's setting the back up alarm off after off shutting off the key. I turn the light switch counter clockwise to shut off auto lights and it goes off. (has been doing this for 5 years) It has new batteries and I have checked them again. I don't seem to getting any amp draw after shutting off unit. Has anyone run into this or similar problem? Sometimes after sitting awhile it just clicks when trying to start but will not turn over. after turning the key a few times it may start. HELP