After five years, I finally had to replace the battery in the Mustang. On the first run out, I had the red battery light up on the dash. We had somewhere to go, or else I would have turned right around and come home!
The battery light persisted through a two other starts, and on the way home, the headlights started getting dim, the ABS and traction control light came on, and finally the headlights just died. Driving that last mile on a dark, windy country road was just awesome!
I ended up stalling it right outside the garage door, since my wife couldn't get it open in time, and it wouldn't start. I pulled the codes, and got a P0622 (Generator Field "F" Control Circuit Malfunction) which seems to indicate a bad alternator. I waited a few minutes, tried again, and the car started.
I'm going to check the voltages when I get a chance this weekend.
So, what I'm wondering is:
- Is my best course of action is to pull the alternator and battery, and get them tested?
- If I didn't see the battery light before the dead battery, does the new battery have anything to do with the issue? Is it possible for a bad battery to kill an alternator?
- Any thoughts on what caused this to happen all of a sudden?