"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 - Adding an Hour Meter - by Steven Gussey. This article tells how I added an electric hour meter to my 1942 Farmall H after rebuilding it. I wanted to keep an accurate maintenance schedule for my rebuilt engine and the implements I use with my tractor, but the H was never available with a tach
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