Posted by Janicholson on August 28, 2017 at 12:32:17 from (199.17.6.160):
In Reply to: re-172 Ford electrical posted by flying belgian on August 28, 2017 at 12:12:49:
With the Key (Ignition) on, the Circuit should be from the I terminal of the key or ignition switch to the resistor. (resistors are sometimes integrated into the wire from the switch) there should be battery voltage there or ~6 volts if wire resistor. If 12v there, it should not have an additional resistor. From the resistor to the coil positive (if negative ground) there should be ~6v there if the points are closed. From the negative side of the coil there should be no volts if the points are closed. With the points open, there will be 12 volts even with a resistor). Most engines stop with the points closed, so there should be no voltage at the points connection (assumes closed points. If there is voltage there, and the points are closed, they are not making contact, clean them. There is never voltage at the center terminal it is connected, but has high resistance and will not show volts. Measuring from the coil negative to the center terminal with an ohm meter set on 10k ohm scale should make a resistance reading. Jim
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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