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Testing voltage regulator of TO-20

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Grass Roots Far

05-29-2002 18:21:56

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I have discovered that my battery is not being charged, and suspect that it is the generator,(the engine stalls when the negative battery cable is removed) but before removing the generator to have it tested and/or repaired, I think I should check the voltage regulator. I am electrically challenged but good at following directions and have good mechanical intuitions. I do have a wiring diagram and will buy a test meter. Any help would be welcome. It doesn't look too hard because there are not that many wires.

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Bill Mc

05-31-2002 06:24:44

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Re: testing voltage regulator of TO-20 in reply to Grass Roots Farmer, 05-29-2002 18:21:56

Hey GRF
I posted this a while ago. Also the archives are full of good info. Good Luck

Bill Mc

Posted by Bill Mc on September 12, 2000 at 16:22:52 from (209.57.221.183):

In Reply to: TO30 Generator/charging diagnosis posted by Jim on September 11, 2000 at 17:57:23:

Hi Jim my TO20 did the same thing.First check the generator brushes.Make sure the brushes are touching the commutator,clean the carbon dust out with air NO CHEMICALS . Also check the brush springs.Next remove the voltage regulator(disconnect battery first)check the cut out relay contact with an ohmmeter. Ohmmeter should read 0.1 ohms. If the contact reads higher then say 1 ohm then clean and polish it with 600 grit emery cloth. recheck the resistance until you have it clean. Cleaning the cutout relay cured my charging problem.I think with a charged battery and tractor running the voltage should be 7 to 8 volts.If you have any more questions post back or email me .Good Luck

Bill Mc

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