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Tractor Talk Discussion Forum

wiring a generator

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jason

02-27-2004 13:09:45




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i am wiring my generator on a allis c i have no lights therefore no light switch, so where do i hook the field wire too? usually it goes on the resistor part of the light switch correct? i am using a cutout any help would be great. thanks jason




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Steve

02-28-2004 07:38:13




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 Re: wiring a generator in reply to jason, 02-27-2004 13:09:45  
hello I recently re-wired my C and did not have a good switch. You can obtain the same function with a D.P.D.T. center off toggle switch an a resistor of 2 or 3 ohms at 10 watts or more. When done the switch controls lights and charge rate like the O.E.M. switch. Sorry I can not post a sketch.
steve



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Alberta Mike

02-27-2004 18:10:06




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 Re: wiring a generator in reply to jason, 02-27-2004 13:09:45  
Well, you could run the field circuit directly to ground. That would be the equivalent of the 2nd position on a 3-position light switch where things are in "full charge" mode (when the battery needs charging). Or, you could run it through a 3-ohm ceramic resistor and then to ground which would be the same as the "in" or first position on those old light switches. This would be the "controlled output" generator control in the 3-position switch (position #1). The third position of those switches was the same as the second (full-charge) only the lights were switched on. I've often thought if you could get a 3-terminal switch from an electrical supply house with one "in" terminal and two "out" terminals you'd have it beat. One of the out terminals would go through a 3 ohm resistor to ground while the other out terminal would go directly to ground. This would give you a 2-position switch (instead of a 3-position switch). You could still hook up lights separately, only they wouldn't tie in automatically with the 2-position generator control switch you have made up but if your lights were on, you'd have your 2-position switch in the circuit which funnels the field circuit directly to ground (full charge). By the way, basic amperage charge rate is done at the generator itself by adjusting the position of the 3rd brush at the generator itself. There is a good article on 3rd brush generators in the articles section under research and info in the left hand margin here.

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Bob Fourney

02-29-2004 08:26:03




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 Re: Re: wiring a generator in reply to Alberta Mike, 02-27-2004 18:10:06  
You said: "I've often thought if you could get a 3-terminal switch from an electrical supply house with one "in" terminal and two "out" terminals you'd have it beat"

Just get a "double pole, double throw" or "2-circuit, double break" switch and jumper the two inputs together. I don't know what they were initially for, but my junk drawer has several switches that make two separate connections with the throw of a single switch. One claims to be rated at 20 amps (but has an "off" connection in the middle, so it's actually 3 position). I don't think you'd have any trouble finding one w/ only two positions. I think connecting the two inputs together (and to the field connectin in your case) would give you what you want? One output goes directly to ground, the other through a robust resistor?

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