I had to pick my wife up 1 1/2 away from our home because the 98 V70 died. It looked like one of the kids had a light on and drained down the battery. So I jumped the battery and let it run for a couple of minutes before driving back. When we came out to the car it was dead again. So I jumped it again and drove for 5 miles until coming up on bumper to bumper traffic and the car died again. I jumped it one more time and drove home without hitting the brakes (mostly highway drive) or using any turn signals or radio. My thoughts are the alternator is bad or there are electrical gremlins (short) in the system. Are there any trouble areas to check? Would the diagnostic computer show error codes for this problem if it was the alternator? The car finally dies in the dealer's lot. I just want to know what may be areas to check before the surgery to my wallet begins at the dealer tomorrow.

Thanks