try polarizing the genny.
jump bat hot to armature.
then check to see if she is charging. IE.. look at meter, and check across batttery when running.
if no charge.... do a motor test.
shut mahcine off.. slip belt off jump bat hot to arm and then ground field.
genny SHOULD spin.. if it spins.. it SHOULD charge.
if it does.. then put belt back on and start up.. if no charge.. jumper field to ground. if it charges.. get a new reg.
if still no charge.. keep field grounded, and then jump arm to bat.. if charge occurs, get a nvew reg..