The single wire that goes into the solenoid coil is connected to the stud that is connected to the battery.
The two wires that are connected together that go into the solenoid coil are connected to the smaller stud that goes to the starter relay or starter switch.
The other large contact stud goes to the Starter motor through a little strap.
If I take a ohm meter and measure from ground to either the battery power stud, or the starter relay/switch stud I get a few ohms; likewise between the two studs.
I can't make this make sense in my head, thinking that the body is negative ground what it's on the tractor, batter power goes to the one big stud, and when you apply power the the relay stud the solenoid fires and connects the moving contact inside with the battery stud contact to the starter motor stud contact to run the starter motor???
The moving contact works fine; I tried it out on my workbench; in a vise. If you're not carefull you could put a hole in something /someone!!!
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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