"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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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