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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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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