I know this has been covered but I' m at work and don't have time to search, sorry! I have a parasidic draw somewhere in my truck I have unhooked the - cable and tested in between the cable and battery with my multi-meter it reads 12.5 volts so I believe I have a pretty big drw somewhere. I have tried unhooking the alt. no change I have pulled every fuse no change I have unhooked about every sensor under the hood one at a time no change. Am I missing something or am I doing something wrong. PS this is a new Optima red top and the alt is charging fine. Please help?