2009 Lincoln MKX automatic 77867 Automatic. Alternator went out on the car killed the old battery Replaced both the Alternator and Battery. Now As i drive the car the Battery Light comes on after about 30 minutes of Driving and when car is Up to operating temperature. The car will keep driving Lights do not Flicker and nothing cuts out. The light will eventually turn back off and then come back on sporadically. Car has driven about 28 miles and 30 minutes with this happening and never died. I had the New Battery tested it passed and Alternator tested and it passed as well. Checked Connections from Battery to Alternator and Resistance of the Alternator checked for corrosion. Belt is nice and tight also. I'm totally stumped at what this could be please if you can i would love some help.
Check the grounding connection from the battery negative to it's connection to the sheet metal for looseness and corrosion. Make sure battery connections are clean and tight.
