Quoting Removed, click Modern View to seeThe 3 post type requires either a ground or battery voltage to be applied to the small terminal to energize. Batt or Gnd depends on the solenoid part number. Most old Fords require a ground to be applied via neutral safety start switch.. Your tractor originally had a 4 terminal unit that needed gnd from neutral safety start switch AND battery voltage from the ignition switch. Later in life there came along another 4 terminal unit requiring batt voltage to one small terminal to activate and the second small terminal supplied battery voltage out to the ign coil during start to bypass the ballast resistor , thus compensating for the lower battery voltage during start. There are even % terminal solenoids.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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