The 4G ford alternator family became common in 1997 and occurs thru 2006, although not as common as in the beginning. It is easily recognizable by the black metal cover on the back of the alternator. “Gray” refers to the color of the voltage regulator. This is the piece where the 3 pin connector is plugged in. Some “black” regulators will be updated with gray. By the time an original equipment 4G alt. fails, it is a 99% chance that the brushes have burnt through the slip ring on the rotor. This is why we need a new rotor to do a rebuild.
Kits include: Remanufactured rotor, 2 new bearings, new voltage regulator.