As John T and Bob M indicate it is the ability to pass some 200 Plus MA on the wire that counts. To do it place the 10 ohm resistor in the wire. (the charging system will work as is this way. To see a LEd indicator light on the panel, measure the volts across the 10 ohm resistor with the key on and tractor not running. This dropped voltage will be what your LED will see if hooked across it Use appropriate resistance to keep it below its max operating voltage. When the tractor is stopped, the alternator terminal is electronically ground. Lighting the light when 12v is placed on it by turning on the ignition. When it is effectively excited, the regulator internal to the Alt. puts charging voltage on that terminal (~14volts are now on both sides of the bulb, or resistor) no flow, alternator runs and will continue to do so until its output goes to zero when stopped. Then the #1 terminal goes to ground again.
If the resistor is not used, (or a diode is used and installed backwards) the 14 volts of the alternator will back feed the ignition switch, making the ignition stay on, not letting it shut off. Thus the resistor/lamp/diode. is needed. JimN
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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