Re: TO20 charging system
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Posted by Gerald on November 08, 1998 at 20:01:43:
In Reply to: TO20 charging system posted by Pat on November 08, 1998 at 16:52:27:
: The charging system on my TO20 is not working. How can you tell if the generator or the voltage regulator is working properly? Thanks. If the tractor has an ammeter you can short out the field connection to force the generator to generate despite the alternator. Do it with the engine running faster than a fast idle. You should see charging current if its regulator and not generator. That connection requires a wire from the field terminal to ground or to the battery terminal of the regulator. I can't tell which, for sure because I'm not familiar (don't have a wiring diagram) for that generator. You can use a clamp on type of DC meter on the generator output wire for that test also. The cutout part of the regulator could still be bad so the next test is with a 6 volt light bulb connected from generator output terminal to ground. Then add the field wire with the engine running. If the generator is working the light should light. If the engine is running too fast, the light may not survive but should at least flash. On a generator that has set for a while its not uncommon for the brushes to not make contact with the commutator. Then it and the brushes need cleaning. Use sand paper, not emery paper, to polish the commutator a little and turn it sand side out and slide it under the brushes to clean them. Check that the wires from the brushes are still attached to the brushes and their wiring. Voltage regulators are most often tested by replacement. With an accurate voltmeter, the ideal 6 volt regulator would regulate the generator output to 7.2 volts, 14.4 for a 12 volt regulator. Contacts in the magnetic type regulator do get corroded and fail to make and thus you get no output. When cleaning them use fine sandpaper or a point file. Remove as little metal as possible and don't bend the contacts or the spring anchors, else you'll change the calibration of the regulator. Otherwise you take the generator and regulator to an automotive electric shop and have them test them. Gerald
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