Hi.. I've got a serious problem with my car. I have a ford contour (i'm ashamed to say that

) But... anyway, the other day the car died on the side of the road. We thought it was the battery, so we had it jumped, and it started and died again within a couple of seconds. So we replaced the altinator, and the battery, and the car started and ran. But the battery light came on. About twelve hours later the car started acting goofy (by the way... the car did this the first time it died) the spedometer started going crazy, the abs light and airbag light came on. And the car once again died. So... we replaced the computer and then the battery. Now the car is running agian, but the battery light is still on. We tested the battery and it seemed low, so it is now on the charger. But any suggestions as to what could be causing all of this. After replacing the computer, battery, and altinator... what else could be wrong?

Please Help!