If theres no ammeter, another way to determine the charge rate is TO MEASURE THE BATTERY VOLTAGE. (DC Voltmeter on proper scale on battery terminals)
A good battery just sitting there with the engine not running ought to read around 12.6 volts (depends on battery, its charge and temp etc) HOWEVER with the engine running at fast RPM if coupled to a good working charging system and the Voltage Regulators Cutout Relay is closed as it should be, the voltage should rise to at least 13 volts and up to 14 or so subject to RPM, belt tightness and condition of genny etc.
When shes running temporarily dead ground the Gennys FLD post and see how she charges then ?? If it charges fine with FLD grounded but not as well or not at all otherwise, the VR may be bad (perhaps its relay contacts are burned or pitted or its mis adjusted),,,,,,,,,,,or the VR may have a poor ground CHECK THAT,,,,,,,,,Or the wire may be bad from FLD on Genny to FLD on the VR.......
If the charge is still weak even with gennys FLD grounded, the genny may need some attention such as: Brushes worn down short (typical),,,,,,,Commutator is oiled or carboned up (clean it) or pitted,,,,,,,,,,Brush hold down springys arent free and holding brushes down tight,,,,,,,,Fields may have problems,,,,,,,,Armature may have some shorts,,,,,,,,,,Bushings/Bearings worn.
Is the belt good n tight and not glazed????
Id check BOTH the Genny and VR have good grounds
May be possible to lightly clean/buff/polish the VR's relay contacts.
Try to clean up the gennys Commutator,,,,,,,,Insure brushes arent too short,,,,,,,,Check grounds (VR and Genny) and connections.
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