Symptoms:
It (battery warning light) sometimes comes on in the day, with no headlights on. The RPM of the engine does not appear to make any difference. Motor runs well at all times. At night, headlights remain bright at idle. Starter turns engine over at normal speed and engine starts and runs well. Serpentine belt appears adequate and there is no squealing.
I am thinking that the generator and or the voltage regulator is the most likely cause. Of those two, I'd guess (and hope, since it is probably cheaper) it is the voltage regulator that attaches to the back of the generator.
Before I start replacing parts, any input from Taurus owners or mechanics regarding most likely cause would be much appreciated.