lilkiller

Whenever I rev over around 4500-4700 my battery light comes on on my dash. Anyone know why?

waggs

your alternators going bad. same thing happened to my car a few years ago

Brute03

i'm thinking alternator too, you can take it to A-zone and have tested to be sure

Chopper

I'm going to say the brushes are worn out in the old alternator and actually bouncing off the slip rings at high RPM.
There are kits available to rebuild your own alt. but if you don't know what you're doing it can be a daunting job.It's not but it can seem like it.
My advice is to see about using a rebuilt Ford unit instead of a generic rebuild from a discount parts supply store.I've personally went through three rebuilt alternators in the time it took to put them on,start the car,and remove the newly failed part.

Brute03

Ford alternator = $300 [:@]