Thanks Knorm I will give it a try. Actually I don't have a fuse blowing problem now that I went from 30 to 40 amp fuse. If this doesn't help I'll have to change the fan to one with a much lower draw. Thanks for everones input eh.As the voltage to the fan drops the fan slows down, uses less power (watts), and draws less current (amps)
As the voltage to the fan rises the fan speeds up, uses more power, and uses more amps.
This is only relevant to your problem with blowing the fuse. You are more likely to blow the fuse when the alternator is charging the battery.
IMO, a smaller alt pulley will still fix your stalling/discharging problem. Even though the fan draws more when the alternator is charging the battery. Your engine rpms will still drop less with a smaller pulley because the alternator will charge much more efficiently at idle and take less engine power to turn.
If you have a one wire alternator like me you might barely be charging at idle right now. One wire alternators are triggered by rpm. There’s a reason they don’t use one wire on anything but tractors anymore.