If it passed BOTH motor tests and if it charges if you dead ground the gennys Field post that tells me the genny is okay
That light switch needs a good clean to frame ground connection you know, you may wanna check that with a meter.
If its a good LHBD switch see if when its in the High Charge position the terminal that connects to the gennys FLD post has a good low resistance to frame ground connection???????
If it charges if you ground the gennys Field but NOT if the gennys field is wired to the light switch, the switch is bad,,,,,,,,,or not wired correct,,,,,,,,or isnt well grounded.
In the low charge position there should be the resistor (3 or so ohms) in series between the terminal that wires to the gennys Field post and ground.
INSURE THE SWITCH IS WIRED RIGHT AND HAS A GOOD GROUND
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