If a good battery ran down in only 15 minutes after you shut her down, I wonder if the Cutout Relay contacts inside the VR stuck closed??? If so right after you shut her down the ammeter would have swung to a heavy - discharge and the genny would get warm. In fact if the belt had been removed it would have spun like the DC Motor it actualy is.
That 13 volt running sounds "decent" as setting the battery voltage would be 12.6 but at fast RPM with a good genny Id expect it to rise to 13.5 or up near 14 depending on the battery state and VR and genny and RPM.
FIRST make sure the Cutout Relay inside the VR isnt stuck closed cuz if so the battery will discharge rapidly and the genny get hot.
Next Id check for a good case ground on the VR and genny itself, maybe try a ground jumper wire (also insure a good tight belt???)
Next Id run Para 5 of my Troubleshooting Procedure where you ground the gennys FLD post to see if she charges then ?? If so but NOT otherwise the VR isnt well grounded or its bad. if she charges fine when you ground the gennys FLD post and the VR has a good ground I SUSPCET THE VR
Check for that stuck cutout relay !!!!!! Check the belt tension !!!!!!!!! Check for a good VR ground !!!!!!! Run my Par 5 grounded FLD test !!! If none of the above, maybe a VR problem
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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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