Posted by Steve@Advance on August 27, 2017 at 20:51:45 from (66.169.147.211):
In Reply to: Re: Starter Issues... posted by kevinthefixer on August 27, 2017 at 19:03:25:
Kevin, that's the way Delco starters have been forever. The solenoid has 2 sets of windings.
The first winding is grounded through the starter post. (That's why a Delco starter won't even click when the brushes are worn out.) That winding is the most powerful, as it has to overcome the plunger spring. Once the solenoid contacts connect, that coil drops out of circuit, the second takes over.
The second winding is just strong enough to hold the plunger in once seated. It is grounded internally to the case.
There are 2 reasons for this design. One is to avoid needlessly consuming battery amperage. No need to keep the more powerful coil energized once the plunger is seated. The spiral shaft drive keeps it mechanically engaged.
The second reason is to prevent the solenoid from overheating during long cranking sessions.
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