Quote:
Originally Posted by cheshired5
A solenoid can easily stick if moisture causes corrosion.
It depends on climate, starter location and starter design. Certainly not impossible.
The solenoid is grounded through the body of the starter and the brushes play no part in this.
This can easily be shown by connecting a 12v feed to the solenoid ignition switch and grounding the solenoid body.
You could have badly worn brushes or no brushes at all in the starter yet still engage the solenoid.
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Not quite right i'm afraid!
As you can see, the current through the pull-in coil in the solenoid runs through the brushes and armature - only when the solenoid is completely in does it run through the hold-in coil direct to earth.
That image was picked at random from an image search for "pre-engaged starter solenoid circuit" so wasn't picked for it's "unique" arrangement - this is arguably the most common arrangement on the pre-engaged starter.
