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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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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