I agree with the other gents, A gennys output is increased EITHER by spinning it faster (smaller gen pulley or bigger crank pulley) or pumping more current through its field windings. However, on the old cutout relay systems that used the LHBD light switch for field current regulation, in the High charge position (and/or with lights on) shes already set up for max field current (max charge). Soooooo at real slow idle RPM's the gennys simply NOT charging the battery as once its voltage drops below that of the battery the cutout relay that connects the genny to the battery opens. i.e. the battery isnt seeing or connected to the genny anyway, and you dont want it to because then (gennys voltage less then battery) the genny becomes a LOAD sucking up battery current versus putting charging amps back into it.
Other then change the genny or the pulleys things that can help are a good tight belt and good grounds on the genny and especially a good light switch ground
Slow idle plus lights on just didnt get the battery charged much or none at all even when all was new on those type and age of tractors, it sorta goes with the territory
Ol John T (Ima gettin old my batteries dont stay up well either it seems)
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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