Madcat, Good questions. OFTEN but NOT always if a genny passes BOTH motor tests as you performed above, it should charge. The gennys output is measured across its Armature which is between the ARM post and case/frame NOTTTTTTTTTT between ARM and FLD. It obviously has to be higher then battery voltage and rises as RPM increases.
For max charge condition YOU GROUND THE FLD NOT CONNECT IT TO ARM
The true test of a charging system is if it will raise the battery voltage !!! A full charged good battery should measure around 12.6 volts subject to temperature BUTTTTTTT if connected to a good charging system battery voltage should rise to at least 13 up to 14+ volts subject to RPM and VR.
When running at fast RPM if she's NOT charging temporarily ground the Gennys FLD post. If it charges then but NOT otherwise, that says the Genny itself is okay and the problem is the VR isn't well grounded or is bad. If no charge even with FLD grounded the genny is likely bad.
SEE WHAT HAPPENS WITH GENNYS FLD GROUNDED !!!! Charge or not ??? Ground the FLD for max charge instead of connecting to ARM.......Insure BOTH the Genny and VR are well grounded !!!!!!!
Work through my Charging Troubleshooting Procedure linked below for a step by step testing procedure, no use re inventing the wheel each time this question is asked.
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