What kind of testing was done on the generator? When checking the generator for motoring make sure the field wire is disconnected or it may not spin. The generator should put out much more than 18 volts at high idle if the is no battery in the system and the field is grounded. Usually the voltage will rise until the armature shorts out. A armature may be shorted only while rotating. The faster it turns the greater the connection of the short as the windings move from centrifugal force.
The generator can be checked on the tractor by bypassing the regulator. Remove the wire from the F terminal on the generator. Start and idle the engine. Jumper the Bat and Gen terminals on the regulator. Check the voltage at the battery and the A terminal of the generator. They should be the same within a tenth or two. If not repair the wiring and connections. Do not overlook the grounding of all components. As you increase the engine speed the voltage should start to go up somewhere around 800 - 1000 rpms. With a good, fully charged battery you should see a maximum voltage in the range of 7.5 - 9 volts. If you have a generator with an adjustable third brush, the closer the moveable brush is set to the (A)rmature brush the higher the voltage will be. Those generators that have a non-adjustable third brush should be at the higher end of the voltage range.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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