My dad has a 89 12v that is completely stock and is a nice running truck only problem is if he takes it to work where he cant plug it in he says if it gets below 25 it wont start. Pretty much the way he put it is if the wait to start light comes on he knows he has to find a ride. It will fire and start but will die out within a few seconds. And will keep doing this untill he kills the battery. Any help would be greatly appreciated.