Originally Posted by adiktid
Where is the regulator located? What does it look like?
The voltage regulator is a small box about 4"X4" located inside the engine compartment on the drivers side .. it's fastened to the side wall just in front of the wheel shock tower. There is a plug with 4 wires connected to the bottom, only one of these wires connects to the alternator (org/light blu).
It's a common practice to replace the seperate alternator and regulator with a "one wire" combination alternator/regulator from a newer Taurus as a replacement (about the same price as an alternator alone) .. so don't be surprised if your present alternator has the regulator built in.
I wouldn't automatically suspect the regulator ... a low battery voltage is much more likely to be a bad alternator, even if you have replaced it recently. It only takes an instant of heavy load to blow half the diodes in the alternator (this can sometimes result in a audible "whistle" from the alternator). Some of these componants can be expensive .. make sure you have a cheap voltmeter ($10 at Walmart) to measure idle voltage before you replace charging componants.