It goes to the red lamp. It is the grounding wire for the lamp to turn lamp on and the sending unit is nothing more or less than an on off switch which is closed to ground when less than 4 psi and opens with pressure above that to turn lamp off. You will also notice, the dump valve is hooked to the clutch pedal and dumps ta pressure when ever you press clutch in and this in turn dumps all lube pressure so light should come on with clutch depressed. If your lamp is on and the wire is cut, that wire is grounded between that point and the lamp.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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