My battery light comes on and off intermittently. The battery checked out OK. on 1999 Ford Ranger

Just started today. On for 5 miles, off for a few more, back on again, all while driving. Dash lights seem to be fading also. Any idea of cost for parts & labor if it is alternator?

Thanks all!

3 answers
Sounds like the alternator only works part of the time.
try the estimator at the top of this page
alt is going bad have it ck'd while light is on