Re: Starter Solenoid - 400D

Posted by Bob on January 26, 2006 at 14:24:14 from (64.21.249.40):

In Reply to: Re: Starter Solenoid - 400D posted by Bob on January 26, 2006 at 14:15:25:

P.S....

The reason for the two windings... one is terminated at case ground. This winding, alone doesn't produce enough magnetism to pull the plunger in by itself, but will hold the plunger in, once it's there. It's the "hold" winding.

The other winding draws more current, for more magnetic pull, but wastes power, and would heat up the solenoid in short order. So, for it's ground, they use the starter windings, which are so heavy, they "look" like a ground to the "pull in" coil. When the solenoid pulls in, and switches power to the starter, both ends of the "pull-in" coil are at battery potential, so it no longer is drawing current.

At that time, the other, grounded, "hold" winding is able to keep the solenoid engaged by itself.

If the solenoid or plunger you currently have are wrong or not matched to each other or the starter, the plunger will not seat all the way into the coil, and the "hold" winding, by itself, will not be able to hold the plunger in, and the solenoid will buzz or chatter.

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