After only a year and a half, the MEAN GREEN 180A alternator for my 2000 X has COMPLETELY FAILED. The first sign war about 6 mos after buying them. The voltage regulators have a reputation of failing on the high side. Mine hovered around 14.2 - 14.7V. Anything over 14 will trigger a Check Engine Light.
I still feel that I overpaid and should have gotten the Villager 130A O.E. alternator.