12.5 volts at battery. When running 14.5 at battery. After a few days battery is dead,
are you checking the battery right after you shut it off? let it sit over night and check it before you start it. how old is the battery? original? if so its probably time to replace it. if not check to see if something is being left on. interior light? also check to make sure the brake lights are not stuck on. sometimes a faulty brake light switch gets stuck on intermittently. also you can have it tested for a parasitic draw.