I was driving down the road and it just turned off, jump started it, went a little further and completely died again. It wouldn't jump start, had to buy a new battery. It ran okay for a little while and did the same thing over again. Had the alternator tested they said it was good at two different places and now I'm in the same boat again, only this time it won't Jumpstart and it keeps making a popping sound and the head lights were flashing does anybody know what this might be?