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Clooney
03-22-2003 07:47:25
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Re: electrical issues on MT in reply to tom, 03-22-2003 06:27:52
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Tom, the usual cause of a generator not charging is stuck generator brushes, dirty commutator or broken wires, & all those things are easily repaired yourself. [just disassemble & clean the commutator & free up the brushes] ~We really need to know if you still have the original cut-out relay [2-wires & small rectangular cover], or it has been converted to a voltage regulator system [3 wires & more of a square cover].
~If it has a 3 brush generator [it should] move the 3rd [movable] brush in the direction the generator turns as far as you can.
~In either case you can do a basic generator test while on the tractor...
~Start with a quick check by running at WOT & shorting the generator [F] post [smaller of the two] to ground, if it charges then you have a broken [F] wire between the generator & headlight switch [or regulator if regulator equipped] , or a bad regulator ground or faulty regulator [if regulator equipped],,,,, then with the [F] post still grounded jump the [GEN] terminal at the cut-out to the [BAT] terminal at the cut-out, if it charges then you have a bad cut-out relay,,,,,If still no charge, shut the tractor off & remove both wires & the belt from the generator then jump battery power from the [BAT] terminal on the starter to the [A] post on the generator, {it should motor} with it motoring short the [F] post to ground, it should still motor but slow down. If it doesn't motor you have generator problems like stuck brushes, dirty commutator, open in a wire, or open or shorted armature. If it motors & doesn't slow down you have field problems like stuck field brush, or open in field circuit.
~If you have a voltmeter place the leads across the battery posts & you should show 7+ volts with it running at fast idle if it's charging correctly [head light switch on]
~The wire between the light switch & generator [F] post must be good & that wire should go to ground through that resistor on the light switch [lights off] & go directly to ground [lights on]..
~The usual cause of a functioning generator quitting to charge is stuck brushes or dirty commutator.
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