i have two warning lights coming on at the same time, that's the charge light and rear light. theyhave beenturning on and off for the past week.i took it to the part store and the guy checked it with some machine and and said that the alternator was reading 15.5 and that was too high. and that it was giving too much charge to the car, but the car seems to be running fine.can someone please give me some advice on what is going on with my car. thanks