I don't know anything about your manufacturer of wind
gen, however if it is direct D.C. Output you can...
Hook a drill to the shaft, attach the output leads to a battery
and use a clamp meter to measure current
with the drill turning the shaft. Alternatively if you only have a multimeter, most of those have a 10 amp current
measuring capability. Run the lead through the meter and control the drill speed to keep the output under 10 amps.
If you gen is ac output rectified elsewhere you can spin the shaft and measure ac volts. Or pull the rectifier and connect and test as above.