Bump and an update...
Started fine this evening, but idled very rough for the first 10-15 seconds. Ran great after that. Smooth idle at stop lights and strong acceleration. Had to make a stop and it started fine once again. Also, headlights might be slightly dim. Battery light and sagging gauge present the whole time. All other electrical (radio, gauges, etc.) work just fine.
Anything that I should consider other than the new battery, alternator and cables?
Don't know if this helps, but I am currently having the same issues with my 2003 mountaineer (V8 if that makes a difference). Got the battery replaced because it wasn't putting out enough amps and every now and then the abs light comes on. I'm also getting a "door ajar" problem when all my doors are closed (checked numerous times).
I was searching around and found this thread:
http://www.explorerforum.com/forums/showthread.php?p=1826865#post1826865
So right now i'm contemplating replacing both the alternator and the instrument panel.