Dad, if the genny motors with the belt removed and tractor isn't running THE CUTOUT RELAY CONTACTS ARE STUCK/WELDED CLOSED which will discharge the battery rapidly plus the genny will overheat if the belt is on and wont let it turn. This is true REGARDLESS if it has a stand alone Cutout Relay only or a full fledged VR since it still also has a cutout relay inside it.
The cutout relay if working correctly is supposed to be normally open (otherwise when the tractor is shut down it will discharge the battery) but when running once the genny works it closes so the battery can be charged.
If you jump a 6 volt battery with 12 volts you can blow up the battery, I've seen it happen many times. However, if you just jump 12 volts to direct to the starter (with battery not in the circuit due to an open switch or solenoid) that will work and it will spin very fast but such (12 volts on 6 starter) can be hard on starter drive Bendix mechanics. Of course you still need the battery 6 volts to the coil and ignition so it will fire.
If its not firing you may be lacking hot voltage to the coils input due to miswiring or a bad switch or an open ignition circuit to the coil. You can try hot wiring to the coil to see if it fires then. OFTEN THE POINTS ARE CORRODED OR BURNED IS ALL THE PROBLEM which can be cured if they are cleaned, polished or light filed with a points file.
I have linked my Non Charging Troubleshooting Procedure BUT ITS ONLY FOR A CLASS A SYSTEM and some Fords used Class B so it may not be correct.
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