Okay, from your pictures and diagram you have a Voltage Regulator so heres how to see if non charging is the fault of the Genny or the VR.
DONT FORGET THE VR NEEDS A GOOD GROUND
DONT FORGET TO PROPERLY CHARGE AN 8 VOLT BATTERY THE VR (if it has a voltage control relay) NEEDS ADJUSTED
TO DETERMINE IF ITS A GEN OR VR OR CUTOUT RELAY PROBLEM
5. a) VOLTAGE REGULATOR SYSTEM: With the tractor running, temporarily ground the Gens Field post to case. If she charges then but NOT otherwise, the VR may be bad, or a wires missing from VR's Field post to the Field terminal on the VR, or the VR isn’t well grounded. YOU DONT HAVE TO UNHOOK THE WIRE FROM THE GENNYS FLD TO THE VR, YOU CAN JUST JUMP THE GENNYS FLD TO CASE FRAME GROUND
6. If she still don’t charge, leave the Field grounded and jump a wire across from the VR's BAT terminal over to its GEN terminal or direct to the Gennys ARM post (jump by passes the cutout relay) and see if she charges. If then but not otherwise, a VR's cutout relay isn’t working correct (maybe points burned/carboned) or not wired correct.
7. With the 2 steps above, you have basically by passed the VR functions, so if she still don’t charge, you're left with a bad battery or wiring or the Gen itself.
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