hey all, been a long time since i logged in! i'm having a problem that i absolutely can't figure out. Lately this winter i've come out in the morning to start my truck and found my radio blasting. it seems to only happen when we get pretty cold (20 degrees or less at night) and i'm worried i'm going to come out one day and find a dead battery. the radio is an aftermarket Alpine that was installed by the previous owner. i've never had a problem with this before, and i've had the truck since 2008. Can anyone offer an explanation on what might be happening?

at this point, i'm suspecting my battery is dying...