Yes, it's your fault. You deep cycled the battery. Buy a new optima. Yellow top. As far as voiding the warranty...just yell "Magnus Moss Act" as loud as you can. They won't have any trouble understanding that. Next time I pull my deck I'll let you know the accessory wire color. I posted an alarm schematic on here a while ago that has an acc. wire on it as well, just do a search.