Posted by Bill VA on February 11, 2017 at 13:29:34 from (216.24.76.146):
It's been a while since if been able to fully troubleshoot my MF50 diesel's starter issue. Went to start it probably a month ago and the battery was very weak, cranked over once slowly and then stopped. Went and got my battery jumper, hooked it up and before turning on the power, the starter tried, ever so slowly to turn the engine. It was as though the starter never disengaged. Glad the battery was already drained. I'm thinking switch shorted all the way. Bought a new switch (starter and solenoid are maybe 9 months old) and thought I'd try to replace the old one. Pulled the old switch out, tested it with a meter and as far as I can tell, it's good, no internal shorting that would keep the solenoid engaged.
Then.....
I do some internet searching and find it a common occurrence that on a DIESEL (regardless of make it seams - which is why I'm here and not the Massey section) when the battery is very low, the starter solenoid can remain engaged, trying - with whatever juice is left in the battery, to start net engine!
Why is this? I would think there is a spring to disengage the contacts on the solenoid when power is removed via the switch (which is why I assumed a shorted switch). Have I got it backwards on the mechanics of a starter solenoid and the springs hold the contacts closed and power from the switch opens/pulls the plunger into the springs, collapsing them and holding them and in doing so, disengaging the starter? Don't think that squares with my wiring diagram.
Why would a weak battery continue to cause the solenoid/starter to crank after the switch is removed from the start position?
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