"I have 12 volts going into pump motor with the switch off but when I turn on/flip the switch on the end of the pump, then the voltage reading goes to 0."
You have a bad connection in the supply wire to the motor. If the motor was actually dead-shorted and dropping the voltage to zero, smoke would leak out of the wiring and/or the motor!
Other possibility (depending upon where you have the(-) probe from the meter connected), is a bad ground.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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