I have a 260amp mechman alternator, and I just got it back from sending it in for repair. The alternator has never charged right from the first day I got it, and I thought maybe after it was warranty repaired it would charge at the correct voltage. Nope after a month of waiting, it charges at around 14.0 from 800rpms-1500rpms. 14.1-14.2 from 1600-up. It's supposed to be 14.4 at idle, but it little rally puts out nothing at anything under 800rpms, which my truck kinda varies from 500-800 for idle. The batteries are fine cause they sit at 13.3, and all my belts are tight. The pulley is already probably the smallest they can fit on this alt, so it's not that. My voltage even drops with only 600w rms, from 14 to 13.8-13.6. I'm getting really tired of it not working correctly, and very soon I need to be pushing a 3800w rms amp, so it's pretty important it works correctly. Any idea? Mechman doesn't seem to know why..