Last week my alternator went out on my 2008 E250 with the 4.6l in it. After replacing it my dash and accessories shut off when I accelerate over 1200rpm. Everything comes back on at idle. The battery light is on when this happens. The alternator is still charging also. We’ve checked all the fuses and wire connections and nothing seems to make a difference. Anyone have insight on what it could be?

Welcome to the site...

Have you checked to see what the charge rate is?