That ground the field test (aka full field) is intended for Class A charging circuits. On the Class B you full field by applying voltage to the FLD post, NOT by grounding it. (Class B has the field windings internally grounded then out to the external FLD post)
When I polarize a Class B system I momentarily flash jump from BAT to FLD unlike a Class A when I jump from BAT to ARM.
If you work your way through my Troubleshooting Procedure linked below it can help find the cause of non charging for Class A Charging Systems (Its NOT for Class B). Its ground the field test and Motor Test (pars 5) can tell if the problem is a Generator or a Voltage Regulator.
On the Class A if it charges fine ONLY with the FLD grounded but NOT otherwise, the genny itself is okay so the problem is either a bad bad VR orrrrrrrrrrr the VR isnt well grounded
INSURE BOTH THE GENNY AND VR HAVE GOOD GROUNDS Try my Troubleshooting Procedure for a Class A system
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