my wife has a stock 03 jetta 1.8t. while she is driving and turns on the ac it all of a sudden loses power and every thing resets. sometimes it stalls. she went to the store the other day and came out and the car wouldnt start. she waited a bit and it started. I went out to check it out and everything seemed fine. I checked the alternator volt output and it was 16.8 volts. a bit high? would this cause a problem with the computer or other electrical components.