On my Lincoln Mark VIII, my son is now driving it to high school. (What a car to have in high school...!) He called saying the low battery light is on again. (Last week we replaced the battery.) I went up to measure it. No drop that I can see from the connections. I measure 12.29V with the engine stopped, and 11.9V with the engine running. If I set the probe right on the alternator, I get the same values. So, I assume it's got to be the alternator, right? Any tips? It looks pretty straightforward.