9n generator turns with battery connected. Not running.

1951 Ford 9n. 6 volt system. Tractor sat for two years. Ran perfect prior. The battery was dead and my brother attempted to jump start it with his car.
It didn't start for him. Yesterday I replaced the spark plugs, distributor cap and rotor button. Still not getting a spark. Today I'll replace the coil, condenser and points.
I took the generator off to gain easy access to those parts. Once the belt was removed from the generator I noticed that it would turn anytime the battery was connected. Even with the ignition switch off.
So my questions are:

What part(s) could've potentially been damaged by Jumpstart ingredients with a 12v system? I want to make sure I'm looking in the correct area.

What's going on with the generator? Surely that isn't normal?

Are their fuses or the equivalent on these tractors? If so where? My tractor has a loader and it's hard working around it.
Thanks in advance guys.

I would assume the cutout relay is stuck closed.

The generator motoring is usually caused by the voltage regulator internal points getting welded together. This can happen easily when jump starting with 12 volts.

As for it to not start I would get a volt meter and start at the starter and work my way towards the ignition switch. The odds are that your not getting any power to the coil from the switch. All you may need a simple switch.

Find out what is wrong and then replace parts.

David I was trying to remember if the 9N had just a cut out or had a voltage regulator???? I am pretty sure it came factory with just a cut out but this site and others show a voltage regulator. So I am confused. LOL

what car are you jumping your 6 v.tractor with?

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.

John T
Class A Charging Troubleshooting

A cutout relay may be a stand alone unit or built in as part of a Voltage Regulator, but like you, I just know what that Ford used, seems most used a cutout relay? Still if its stuck closed the genny will motor if it can lol

John T

I do not know, but the regulator should have a set of points to do same thing.