Last August the front bearing on the Moto alternator started screaming, so I bought one of those $90 chinese wonders from ebay. Well yesterday, after I started it the red light stayed on. Tried couple more times and revving it too, nothing changed still red. Well after I backed the tractor out of the barn the light went out, so I thought fine. Not much later it came back on and is still on. Put the voltmeter on the thing today after charging it overnight with the smart charger. Solid 13+ volts on battery until I turn on the ignition and it starts dropping but not quickly. Start it and voltage drops to 12.3 or so and keeps dropping. Is this a good indication the alternator has gone bad or could it still be the regulator? I've got the Tech book, but reading about testing the alternator is pretty confusing and I don't have a resistor pile, but for sure the battery is not charging, but how to know if it's the alternator or regulator. I do have a 1yr warranty on the new alternator and I still have the Moto but haven't gotten the center race off the shaft yet. The outer race just fell off. I thought I may just buy some brushes for the Moto and a new bearing. It was working when I took it off. I don't know how the warranty works if the guy is going to make me send the old one back yet. So I want to know for sure it's the alternator before I do.