Yours is NOT the only one Ive seen act that way when I was a used tractor dealer.
If you were to use a jumper wire to dead ground the gennys FLD post when running at high RPM that will show the max charge the genny is capable of WITHOUT RELYING ON ANY REGULATION SYSTEM (VR or Manual Low High), thats it. If thats what it charges when left on its own the genny is probably okay, but if less on its own, then there may be a regulation system problem. If its a full fledged Voltage Regulator problems may be its adjustment or relay/contacts or its ground,,,If its a Cutout Relay system with Low High Light switch manual charge control scheme, the switch may not be well grounded or bad or the wiring from FLD on genny up to Low High switch.
Some older 3 brush gennys had an adjustable third brush and if set/adjusted closer to the main brush next to it the charge rate increases. I would check and insure the Low High switch (up on dash) or VR (by generator) if so equipped has a good clean ground connection.
Insure the belt is good n tight.......I dont get into any VR or Cutout Relay adjustments over the net (other than perhaps lightly buff polish relay contacts).........It may help to give the gennys commutator a good cleaning and shining and if necessary undercut between segments to reduce brush bounce.......CHECK ALL GROUNDS genny as well as Low High Switch or VR if so equipped....... NOTE if the gennys brushes are worn down getting low could cause problems and they should be replaced
Below is my Troubleshooting Procedure check it out
Did I mention CHECK ALL GROUNDS ??? Cutout Relay to Genny,,,,,,,,,,VR if so equipped,,,,,,,,Low High Manual Switch,,,,,,,,Genny itself. If dead grounding the genny still yields the same charging current as if nothing were done the genny is likely okay so check all the other things I mentioned
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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