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Old Feb 13th, 2019, 20:51   #15
cheshired5
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Last Online: Dec 26th, 2021 14:42
Join Date: Dec 2013
Location: Crewe
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Quote:
Originally Posted by Laird Scooby View Post
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.
I've rebuilt and bench tested enough starters to be confident in my description.
The solenoid can absolutely 100% be operated without the main starter being energised in fact the main starter can only be energised if the solenoid has been activated in the first place to bridge the permanent live feed to the brush pack.

Without independent solenoid operation, the brushes receive no voltage.
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