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Baler, from your description, that "box" sounds like a 3 wire Voltage Regulator. On those the VR's FLD terminal connects to the Gens Field post,,,,, ,the VR's GEN (or ARM) terminal connects to the Gens Armature post,,,,, ,,,and the other terminal is BAT and it usually wires to the ammeters load terminal or an electrically equivalent location. If it were a 2 wire cutout relay it would have but 2 terminals, one labeled BAT up to the ammeter and the other labeled GEN (or ARM) which wires to the Gens Armature post. On those, the Gens Field post is wired up to the light switch. To "motor test" a Generator, first dead ground its Field post to the case/frame,,,,, ,make sure the Gen is well grounded and have the belt removed,,,,, ,then apply hot battery voltage to the Gens Armature post..... ... If it spins well as it should, that usually means the armature and brushes are in decent shape and then when you unground the Field it should speed up which usually means the Field windings are okay. If it passes BOTH tests above it usually will charge. You have to have a good working Voltage Regulator the correct voltage for the tractor or else a correct voltage 2 wire cutout relay on systems that use the light switch type of Field control. On those the Gens Field post wires up to the light switch where it gets its ground. John T, retired electrical engineer in Indiana
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