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6V generator/regulator woes

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Georgia Boy

08-08-2005 16:57:34

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I had the brushes replaced on my 6V generator and the cutout replaced with a new 6V positive ground regulator that has F, GEN and BAT terminals. My switch is still the old 4 position type. When I hooked up the new generator I did not connect the wire that runs to the field resistor, just taped it and left it loose. The wiring harness is brand new and I connected the switch as shown in the wiring diagram. But... I only get about 3 amps of charge when running and when I turn on the lights I get a discharge of about 9 amps. What do I do now? Before I started this restoration nothing was working at all. Would an old battery act like this?

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Hermit

08-09-2005 11:12:00

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Re: 6V generator/regulator woes in reply to Georgia Boy, 08-08-2005 16:57:34

The voltage regulator isn't concerned if it's controlling a 2 or 3 brush generator. The voltage regulator just controls the electron flow through the field coils that increases or decreases the magnetic field density. The only real concern would be if the generator is internally grounded or externally grounded. This would reguire different types of regulators; one acts as the ground of the field coils and the other acts as the voltage source for the field coils. I hope Georgia Boy got the right type regulator.

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Dellbertt

08-09-2005 08:33:17

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Re: 6V generator/regulator woes in reply to Georgia Boy, 08-08-2005 16:57:34

If I read correctly I think you renewed the brushes in your original generator. I may be wrong but I don"t think a two brush generator will work correctly with a full voltage regulator. I"ve always thought a 2 brush runs a cutoff and a 3 brush runs a voltage regulator.

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Hermit

08-08-2005 20:54:56

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Re: 6V generator/regulator woes in reply to Georgia Boy, 08-08-2005 16:57:34

If you have a three brush generator, the third brush is used to adjust the amperage output. Did you install the new brushes with the pre-cut angle going the right direction? Did you seat the brushes with sandpaper or seating compound? Is the voltage output at the generator per specs?
An old battery wouldn't cause this malfunction.

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John T

08-08-2005 18:53:54

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Re: 6V generator/regulator woes in reply to Georgia Boy, 08-08-2005 16:57:34

Georgia, It sounds like what you did is replace the older simple 2 wire cutout relay with a full fledged 3 wire voltage regulator. That kind of VR is intended to replace BOTH the cutout relay PLUS the light switch type of field current regulation. Wire it:

BAT terminal up to the ammeters load (NOT to battery) terminal.

GEN on VR to Gens ARM post

FLD on VR to Gens Field post.

Then DO NOT run any wires from the Gens Field to the light switch and the Gen and VR must both be well grounded.

John T Nordhoff in Indiana, retired electrical engineer

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georgia Boy

08-08-2005 19:54:07

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Re: 6V generator/regulator woes in reply to John T, 08-08-2005 18:53:54

That's the way I have it, if I understand your message correctly. I have BAT on VR wired to the load side of the ammeter and there is nothing connecting the generator or regulator to the field resistor on that switch, that wire is just left loose and tape up. I have the regulator and generator wired together as you indicate. I'm baffled. I will check the grounding a little more closely when I get in from work tomorrow. Thanks.

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Bob M

08-09-2005 04:26:49

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Re: 6V generator/regulator woes in reply to georgia Boy, 08-08-2005 19:54:07

GB - Make sure you've got it wired up exactly as John T describes above. Also make sure the regulator base is SOLIDLY grounded (system won't work right if it is not...)

Then if the generator output is still low, temorarily ground the generator F terminal to a good ground - the grounded battery post is best. (This bypasses the voltage regulator and drives the generator to maximum output.)

Now run the engine at full throttle. If the generator is good the ammeter will show 12 - 15 amps or more. If output is less, either the 3rd brush needs adjustment or it's time for a generator rebuild.

Good luck!

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georgia Boy

08-09-2005 15:46:10

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Re: 6V generator/regulator woes in reply to Bob M, 08-09-2005 04:26:49

I ran a jumper from generator F to the positive ground post on the battery and things remained the same, very little charge at any speed. When I made a jumper from GEN to BAT on the regulator the ammeter showed a discharge of maximum amps (20) with the tractor not running and only a couple of amps with tractor running. I have I friend who restores tractors and will have him look at it. I'm tired of swatting mosquitoes and working in the heat and humidity so will wait for more civilized weather before proceeding with this problem.

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