I've had that happen before. Many times it was because the contacts in the starter solenoid (subject to what kind you have) got stuck/burned/welded together. Perhaps the starter got rebuilt but NOT the solenoid????
If the start switch (depending on the switch and system) somehow maintained electrical contact in the START position that could keep the starter/solenoid engaged. That was rare in my experience...�..
Its possible to use some jumpers to duplicate the start switch function (to send voltage down to solenoid) and/or do similar to jump hot voltage direct to the solenoids activation terminal for troubleshooting.
Typically I saw that happen most often in either extreme cold weather (starter drawing high current) or the battery was weak or there was a bad cable or connection or poor ground.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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