Glenster, The Jimster knows this stuff as well or better then me, and it looks like we agree. Heres my thoughts:
When she was running and you jumped the VR's BAT to GEN/ARM and you got a heavy discharge n spark, Ima thinkin thats cuz the battery was reverse discharging through a BAD maybe something shorted genny. If the genny was working and you made that jump (BAT to ARM/GEN), thats supposed to simulate a cutout relay closure so the genny can charge the battery (if its good that is).
Also with the gennys FLD post dead grounded to tractor frame and the cutout relay by passed (BAT jumped to ARM) the VR is essentially out of the equation and if theres no charge its cause of a bad genny.
Another thing pointing to a bad genny is its failure of the Motor Test. When you apply voltage to the ARM post it should spin fairly fast n smooth n steady, but then speed up some but continue running if the FLD is ungrounded. If it dont it about has to be a bad genny in my opinion.
Of course BOTH the genny and VR need good grounds to work properly but from what you say that genny just isnt acting right and still wont charge even if the VR is out of the equation (assuming grounds and other wiring is correct)
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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