BX23 Will not shut off

Orange Newb

New member

Equipment
BX23
Jun 18, 2025
4
1
3
Lynchburg VA
I've read several threads on this issue but mine problems are bigger and 'different.' Engine starts even when I am not sitting on the chair and even when in gear. Not safe! But will not shut off with the key. The fuel stop solenoid works fine when I put 12 volts on it, but what confuses me is that 12 volts EXTENDS the pin of the solenoid that shuts off the engine, which I can also do with my finger when the solenoid is out. So 12 volts to the solenoid is designed to STOP the engine! One question is "where does the 12 volts to activate the fuel stop solenoid normally come from when one shuts off the ignition?" A mystery. Then, to add to my confusion, the wiring diagram in the Kubota repair manual shows THREE wires to the solenoid, but my tractor has only two. More confusion. Finally, the repair manual says that a bad solenoid causes the tractor to not shut off (mine works fine..just like the new one I bought.) But the manual also says a bad 20 A fuse will have the same effect. So I checked the 20 A fuse, it was bad, and I was so excited to have found the solution. But, alas, putting in a good 20 A fuse...no change/same issue...won't shut off, but now even the gas gauge doesn't work, which is was doing when I had a bad 20 A fuse. Can anyone help me sort through what I should do next? THANKS!!
 

hagrid

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Jun 11, 2018
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The stop signal comes from a timer, I believe. When the timer expires the solenoid retracts to its neutral position and the fuel rack returns to idle.
 
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Orange Newb

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BX23
Jun 18, 2025
4
1
3
Lynchburg VA
The stop signal comes from a timer, I believe. When the timer expires the solenoid retracts to its neutral position and the fuel rack returns to idle.
Thank you. I'm thinking the relay timer (also a relay stop solenoid?) is the issue then. Would you suggest throwing a new $50 part at it and see what happens? I hate doing that. already bought a new fuel stop solenoid and that was a waste of money, but I am out of smarts on this one.
 

RCW

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BX2360, FEL, MMM, BX2750D snowblower. 1953 Minneapolis Moline ZAU
Apr 28, 2013
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Before I replaced any more parts I would spend some time with a multimeter and see where and when your getting power in the circuits for shutting it down.

Lords knows and I’m just guessing could be anything including the key switch…..
 
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Orange Newb

New member

Equipment
BX23
Jun 18, 2025
4
1
3
Lynchburg VA
Before I replaced any more parts I would spend some time with a multimeter and see where and when your getting power in the circuits for shutting it down.

Lords knows and I’m just guessing could be anything including the key switch…..
Thanks. I have confirmed it's not the key switch. It does everything it's supposed to do. And since the Kubota manual shows 3 wires to my fuel stop solenoid, and my tractor has two, I'm not sure how to trace down the "power-down" circuits with any level of knowledge.
 
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North Idaho Wolfman

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Jun 9, 2013
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I'm betting you have BX23D and your looking at a wiring diagram for a BX23S or visa versa.
The two model are no near the same.

Wanna give me the serial number and I'll tell you which model and which manual you should be looking at.
 
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Hugo Habicht

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G1900
Jun 24, 2024
525
675
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Ireland
Did you check that the 20A fuse you replaced is still good? There is a reason why the fuse blew, typically there is a fault behind the fuse (cable, solenoid) that has to be found and repaired first before replacing the fuse.
 

Orange Newb

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BX23
Jun 18, 2025
4
1
3
Lynchburg VA
Did you check that the 20A fuse you replaced is still good? There is a reason why the fuse blew, typically there is a fault behind the fuse (cable, solenoid) that has to be found and repaired first before replacing the fuse.
Excellent recommendation. I'll check the circuit for fault and also check to see if the 20A fuse is still good. Is there a way to meter out the relay stop solenoid to confirm that it's good?
 

Hugo Habicht

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G1900
Jun 24, 2024
525
675
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Ireland
You could measure the resistance or maybe with an ampmeter connect it directly to the battery and see if it moves and how high the current is. Resistance may be low, below 1 Ohm and may be difficult to measure because of the leadnand test clip resistance. Short test leads, note resistance, connect test leads to solenoid and subtract the shorted value from the reading.

I you have a hard short somewhere it helps to connect a 12V incandescent bulb instead of the fuse. When the short is present (could be intermittent, wobble at the cables) the bulbs lights up. Saves you buying fuses by the truckload :)