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~ 1991 STX38: Starter engages, engine cranks but won't start, when key is turned off, engine continues to crank. Disconnected battery to stop engine from cranking. Upon attempting to reconnnect battery engine cranked again without seat safety switch being made up. Also engaged PTO and tried to reconnect battery but it cranked again. Safety switches seem to be bypassed by this problem. Is this an ignition switch the likely problem?

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The starter solenoid may be stuck in the on-position. To check this, on the starter, remove the small wire connected to the solenoid coil terminal. If the starter still runs, the solenoid is stuck on. If rapping it with a hammer doesn't stop it, the contactor pin is welded to the motor contacts.

Posted on Jul 02, 2017

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Posted on Jan 02, 2017

SOURCE: Ignition does not crank engine

If it is cranking over it should start. If you are just jumping the solenoid then you have a switch problem.If it is just plain not starting then you need a complete tuneup. It a process of elimination, you need air, gas, and a spark. Then it will run.donnyb60

Posted on Mar 23, 2009

mowerman1857
  • 389 Answers

SOURCE: Trying to find wiring for safety switches: Brake,

When you turn the key to START does it click? If yes, replace the solenoid, if no, check first for a bad fuse. Usually right behind the engine on the right side of the tractor. Using a test light or VOM meter you could also check to see if it is getting voltage at the small post on the side of the solenoid. Depending on the make and model number of the unit, it could have one or two small posts, one would be ground the other 12 volt positive. If it only has one, it would be 12 volt positive. If you get voltage there when you put the key in START position , then it is definitely the solenoid
You weren't very clear but when you jumped across the solenoid if it started and ran that would verify one or the other of the above.
You don't give a model number and this is NOT a generic problem,every tractor has specific wiring so in order to find a wiring diagram, you first need to know the model number and brand.

Posted on Oct 22, 2009

  • 16 Answers

SOURCE: the pto on my 4 year old cub cadet lt 1042 will no...

check for bent parts try some wd40

Posted on Jun 02, 2010

  • 6468 Answers

SOURCE: pto wont work

try and bypass the safety switch on the clutch/brake pedal

Posted on Apr 13, 2012

radco855
  • 126 Answers

SOURCE: Can malfunction of PTO or other safety switches prevent start up of mower

You didn't state the model or brand of tractor, but usually the way the cranking circuit work is, from the "S" terminal of the ignition switch, the circuit runs to the PTO switch, if it's in the OFF position, the circuit then runs to the pedal switch, if it's in the DOWN (or brake on) position it then runs to the solenoid. On other tractors, from the ignition switch, the circuit runs to the pedal switch first. (The seat switch isn't used in the cranking circuit).

Any switch can go bad, but I would more likely suspect the pedal switch or loose connection at either switch. (But it could actually be the PTO switch).

Try tracing the circuit from the "S" terminal of the ignition switch through the PTO or pedal switches to the starter solenoid. You may get lucky and find something obvious.

If you find nothing, try jumping across the pedal or the PTO switch (only two terminals are used in the cranking circuit, trace back to ignition switch for the incoming, outgoing is usually directly adjacent). Jumpering will take these out of the circuit and tell you if either is bad internally.

Lastly, there's always the possibility that the ignition switch is bad. (Doesn't happen all that often, but it's suspect as well). Jumper from "B" terminal to "S" terminal will take it out of the circuit.

Posted on Aug 22, 2012

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