Ford 4000 Starter engage's when key is ON without switch

Hello,

The tractor is a 1963 Ford 4140 HD Industrial 4-cylinder gas. This tractor is great, I use very often. However I have a new problem. A few days ago I came outside to get firewood and heard a mechanical noise. It was my tractor turning over. The key was on the seat where I always put it when I finish using it. I always leave it in neutral.

I disconnected the battery and removed it and charged it. My initial thought was starter relay so I replaced and tried again. This time the engine began turning over when the ignition switch was turned to ON and without the starter switch connected! I connected the starter switch but this made no difference. I also depressed the starter switch while it was turning over and the wire to it began to fry. I did a continuity test between the starter flange and starter switch and had continuity when I depressed the starter switch so the switch appears to be working properly, completing the circuit to ground allowing the starter to engage when depressed (under normal conditions). At this point I can start the tractor but the starter is still engaged so obviously I can't run it.

I'm stumped... please if anyone with experience has any ideas I need help with this. Thank you.
 
I think so but could be wrong... first I got one from Napa but then I thought maybe it was grounding itself out with the mount so I got one from Tractor Supply for the Ford 4000 series tractor but still same
results.
 
(quoted from post at 17:47:21 12/21/22) I think so but could be wrong... first I got one from Napa but then I thought maybe it was grounding itself out with the mount so I got one from Tractor Supply for the Ford 4000 series tractor but still same
results.

There were two different 4000 series tractors. The earlier 4 cylinder 4000 used a solenoid with an isolated primary that used the push button starter switch on the transmission to complete the circuit to ground. The later 3 cylinder 4000 series used a solenoid that grounded the primary trough the case of the solenoid and the key switch provided the hot voltage to complete the circuit. Just because a solenoid is advertised as being for a Ford 4000 tractor does not mean that it is the proper one for your Ford 4000 tractor.
 
I would give you something else to check.
If the wire going to the switch on the transmition is shorted out, that could cause the starter to not quit.
So start by taking the wires off of the small posts.
HTH
 
This is the wiring diagram for my tractor. Is this correct, is the starter switch connected to the s ?


cvphoto143487.jpg
 

If you have the correct, insulated base, starter solenoid the two small terminals are connected to the ends magnetic coil winding and it does NOT matter in which order the wires are connected to them.


oAbhISY.jpg


Circuit #4.
 
Okay that makes sense now. While the diagram I posted showed the s terminal going to the starter switch, the starter switch was connected to the i terminal. I just need to wait until I receive the Item #: 105689 12v starter solenoid from yesterday's tractor that I ordered yesterday.

Thank you for this diagram showing different solenoid wiring.
 

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