I"m with the guys as far as its a failed/open Low charge Field Resistor on that LHDB switch. I think thats the flat wound one and the coiled wire one is the light dimmer resistor???
The switch itself must have a good ground if she charges so well on high charge which essentially places the Field at dead (no resistor) ground.
If you unhooked the wire on the light switch that feeds down to FLD on the genny and place an ohm meter there to frame ground, it should read near 0 ohms in High Charge and around 3 or so in Low charge. If in Low charge its an open circuit (not the 3 ohms) she cant charge in that Low position.
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