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Allis Chalmers Discussion Forum

CHARGING

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DENNIS KNUTSON

12-06-2007 07:26:13

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My AC WD does not have the 3 position light switch that I read about in the manual which seems to be a vital part for charging. Is there another way? Any help on this would be great.
This tractor is also running on negative gorund.
thanks,
dennis

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John T

12-06-2007 09:47:41

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Re: CHARGING in reply to DENNIS KNUTSON, 12-06-2007 07:26:13

Dennis, What the 3 position combination light and charge control light switch did was to provide the gennys FLD post with a dead ground for HIGH charge (and when lights ON) or a resistive ground for LOW charge. The genny then just used a simple 2 terminal (BAT and GEN) Cutout Relay on the generator, there was no Voltage Regulator. Its possible to change the system over to a full fledged Voltage Regulator system which replaces the light switch control plus has a built in Cutout Relay and then you can control lights with a regular On/Off light swtich which dont have anything to do with the genny anymore.

If the gennys FLD post were temporarily conencted to frame ground it will max charge all the time (unregulated) but could overcharge n harm the battery especially if left that way for extended periods with no lights burning, although Im sure fellows have done it i.e. just grounded the field to get her to charge n got by with it. A jury rig would be a low/high toggle switch to dead ground the field for max charge n leave it there after start up a while but then have like a 3 ohm power resistor wired n switched between the gennys FLD post n ground for Low charge, thats all the regular combo light/charging switch did.

John T Retired Electrical Engineer

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JMS/.MN

12-06-2007 09:02:29

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Re: CHARGING in reply to DENNIS KNUTSON, 12-06-2007 07:26:13

Originally the generator was 6 volt, positive ground, with a relay on top. Even if it still has a generator, it could have a voltage regulator instead of the cutout relay, which used the 3 position light switch to control charging rate.

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DENNIS KNUTSON

12-06-2007 14:29:30

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Re: CHARGING in reply to JMS/.MN, 12-06-2007 09:02:29

would any 3 position toggle switch work?
there was 3 position switch on it when I got it, but that broke so I replaced it with a toggle switch and since have had trouble with charging.
maybe wrong switch or hooked up wrong?
thanks, dennis

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JMS/.MN

12-06-2007 22:24:38

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Re: CHARGING in reply to DENNIS KNUTSON, 12-06-2007 14:29:30

No- like John says, you need the resistor that is in the 3p switch- otherwise you are not changing anything. First of all, determine what generator you have, voltage, VR or cutout.

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John T

12-06-2007 14:58:36

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Re: CHARGING in reply to DENNIS KNUTSON, 12-06-2007 14:29:30

Probably not, it needs the correct set of terminal inputs n outputs and orientations, it would be much simpler to just get a correct switch as they arent all that expensive plus they have the necessary low charge resistor built right on them and control lights and charge rate. They require a lights voltage input terminal and output when lights are on plus an isolated terminal that wires to the gennys FLD post and need to have a ground connection. Then when in low charge it has to connect the resistor in series between the gennys FLD post and ground but in high charge (and/or when lights on) it has to connect the gennys FLD to dead ground.

SO MUCH simpler to just go buy the right switch unless you convert to a full fledged Voltage Regulator.

John T

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