Posted by Bill VA on August 27, 2017 at 13:39:00 from (216.24.76.146):
Have a thread going on the MF section, but posting here to get a wider audience....
Recently replaced the solenoid on the starter for my formally trusty MF50 diesel as the thought was it was welded closed. With the new solenoid in place, turn the switch, nothing. Battery is good and fully charged.
Today, I bypassed the key starter switch with a momentary push button switch. From leg 'L' off the voltage regulator to the 'S' terminal on the solenoid. Keep in mind the solenoid is new and starter is almost new. The idea was to rule out the key switch and neutral start switch as the problem and see if the solenoid and starter would work as advertised.
Push the switch (range and gears in neutral and the fuel shutoff - off), the starter spins like a champ - yippie!!!!!
Let off the switch, the starter keeps turning - dang. Luckily the hot side of the battery wasn't cranked down and I quickly pulled off the cable to the starter.
Put the battery cable back on, no cranking (as it should be), pushed the momentary switch, starter spins great, won't stop spinning - again quickly pulled the battery cable to the starter.
Almost new starter, new solenoid. What the heck is going?
Again what got this going was a low battery and the thought that I had welded the solenoid via low voltage. Changed out the solenoid, turned the key and nothing. Today's effort was to bypass the switch and be sure the solenoid/starter would work, isolating the switch, but what I've got is a continuous running starter motor after initiating a start via the switch.
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