Alright my sister's 99 Cougar had a dead battery, according to the "idiot light". So I went and got a new battery and tested the old one, which came up dead. So after I replaced the battery the light never went off. Does this mean that the alternator could be shot? Its only been a few hours so the new batter is not dead, yet. If the alternator is dead, how much of a pain is it to replace?
