First the basics: I have a 2007 King Ranch with the 5.4L 3V Triton motor and with 187K miles.

Lately the battery light on the dashboard has been coming on for a few seconds at a time, and today it came on again and the message "Check Charging System" was displayed for a minute or two.

I know the previous owner had some issues with the alternator and charging about a year ago, but I don't know exactly what the problem was or what was done. I think the alternator was replaced. I've owned the truck 7 months without any electrical issues until now.

What gives? Is this a known issue? What should I be looking at under the hood? Thanks!