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High low battery charge settings for a '47 Farmall H

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atw

01-18-2002 09:41:05




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I have a wire running from my light/charge switch in the electrical box that used to hook to the "field" terminal of my 6V generator. The generator was not fielded to the voltage regulator which caused the generator to go bad. I had the generator rebuilt, and its now fielded, and puts out a good charge, but there is no difference indicated on the ammeter when I switch between the low & high settings. Am I correct in thinking that I should reconnect that wire from the light switch back to the "field" terminal, or does it go somewhere else? I'd hate to burn out the generator again if I hook something up wrong.

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steve

01-18-2002 19:10:38




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 Re: High low battery charge settings for a '47 Farmall H in reply to atw, 01-18-2002 09:41:05  
a newer 12 volt system uses a votage regulator because it has a high current output.
the older 6 volt systems had lower output current generators. some only put out 10 amps maximum. there were two differnt types of "regulators" for the 6 volt syste. the most basic is the "voltage cutout" which is a small box mounted normally on the generator. the G terminal on the generator gos to the G or a terminal on the cutout, and the other cutout terminal goes to the battery. the F terminal on the generator goes to the light swithc. there is a resistor in the light switch which acts as the "other half of a voltage regulator". the generator puts out 2-3 amps during the day with the light switch off (resistor in the circuit). when you pull out the switch the F terminal is connected straight to ground and the generator runs full out (about 8-10 amps) this works with the lights on. the cutout relay on the generator is adjusting the "voltage" to 6-7 volts at all times. the second type of "regulator" is an actual voltage-current regulator. it looks like what was used on cars in the early 1960 era. a black box about 3 inches square with three terminals on it (maybe 4). in this setup the resistor which was in the light switch is now in the "regulator" and works automatically to varry the chargning rate. you dont need to turn the light switch on or off. both the G and F terminals on the generator go to the regulator in this setup. the third terminal is B and goes to the battery.

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hermin the goose

01-18-2002 15:54:52




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 Re: High low battery charge settings for a '47 Farmall H in reply to atw, 01-18-2002 09:41:05  
6v gen- is that a third brush gen?, not seeing the tractor or gen, little hard- time passes parts get changed out. delco gen? should be A circut- the gen, reg -how the feild is grounded. if B circut, and ya put volts to the feild bad things can happen. check bat with hydroeter=spellin is not my strong suit-so you can see what the state of charge really is. now the wire you speak of-- did that year have only a cut out on the gen?and a third brush gen? if so- and now you have a voltage reg on it, the wire is a thing of old

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The Red

01-18-2002 12:15:28




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 Re: High low battery charge settings for a '47 Farmall H in reply to atw, 01-18-2002 09:41:05  
Pull your light switch cover and make sure the wire is hooked to the bolt at the very bottom of the light switch assembly next to that flat looking 2 inch long resistor. If it is, you can hook the other end to the field post on the generator. You may get a difference on the ampmeter between low and high charge settings on the switch. Unless your generator is really charging high, I always leave the switch in the high charge position.

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atw

01-18-2002 14:29:21




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 Re: Re: High low battery charge settings for a '47 Farmall H in reply to The Red, 01-18-2002 12:15:28  
Red,
The wire is connected to the resistor at the bottom of the light switch. I will hook the wire back up to the field post, and see what happens.
Thanks for the info.



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Geoff Gauger

01-18-2002 10:19:36




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 Re: High low battery charge settings for a '47 Farmall H in reply to atw, 01-18-2002 09:41:05  
Are you sure you have a voltage regulator and not a cutout relay?



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Mike ISW

01-18-2002 16:07:24




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 Re: Re: High low battery charge settings for a '47 Farmall H in reply to Geoff Gauger, 01-18-2002 10:19:36  
How would one tell the difference?

And why is there 2 different components used ?



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Geoff Gauger

01-21-2002 10:30:08




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 Re: Re: Re: High low battery charge settings for a '47 Farmall H in reply to Mike ISW, 01-18-2002 16:07:24  
The cutout is older technology, it has two components inside, a wire wound resistor and a solenoid. The resistor is in the ground circuit for the field and will not be used with the four position light switch. With lights, a similar 2.8
ohm resistor is mounted on the switch. Depending on the switch position, the field is either grounded direct to the frame or through the resistor to the frame. A stronger ground means higher generator output. Without lights, the field is either grounded to the generator case directly or through the resistor in the cutout and then to the case. Same effect as with the light switch. The generator will have four terminals, G,F, BAT, and L. The solenoid in the cutout simply breaks the circuit to the battery when the engine is not running to keep the battery from discharging.

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JDM

01-18-2002 09:51:07




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 Re: High low battery charge settings for a '47 Farmall H in reply to atw, 01-18-2002 09:41:05  
Leave it alone its fine.That light switch wire should go to the L terminal on the regulator.



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