Great unit but. . .
"Purchased this alternator because my factory one went out and I decided it was time for an upgrade. I put about 1500 miles on it before it started acting up. Voltage would spike to 15. 6v then drop to 11. 5v erratically. After checking the trucks electrical system, I found the regulator inside the unit was the issue. Called Powermaster to try and warranty it. They stated that it was my truck that was the issue. I took apart the alternator after the call and found the regulator was loose and the contacts were worn unevenly. Installed new American made regulator and have put almost 5500 miles on the truck without any issue. Hopefully mine issue was only a one time thing for the manufacturer"