I have a '97 Astro with 81.5k miles. I had an alarm professionally installed because I have some expensive stuff inside, and also to prevent the theft of my Cat Converter. My battery is 2 months old, and my alternator is maybe just short of a year old. My battery dies easily, and I have noticed a loss of power when I accelerate recently. I have a AC/DC tester ohm meter. Is there a way to figure out what is draining my battery? Thank you in advance.