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AC mod CA geneerator/requlator

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actex

02-17-2005 06:46:17




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I purchased an AC mod CA, Generator was'nt charging. Had it repaired charged excessivly, burned up. ordered a new one just like it. It apparently was the wrong generator. I beleive it is made for a requlator-third brush not adjustable. I would like to maintain the original
configeration but, rather than going through the hassle of sending it back, I have decided to rewire on use the requlator type. can anyone tell me how to rewire it. My manual only shows the cut-out type.

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phil(va)

02-18-2005 06:19:37




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 Re: AC mod CA geneerator/requlator in reply to actex, 02-17-2005 06:46:17  
Tex, I have a CA and have had a similar experience as you, except my tractor was converted to 12 volts, but with a gennie, not an alternator, so not that different from your experience as my gennie is a 3 brush non adjustable 3rd brush version, like yours. (Of course i'm neg grnd now, and you are pos.) Anyway, whoever converted mine put a "modern" cutout relay on the gennie, similar to the 6 volt cutout, but that really isn't enough to regulate it. The old light switch manual process was long gone, and that isn't very satisfactory anyway. I took my gennie to a good shop and they installed a VR on the gennie, using a rubber shock mount to dampen vibration, and adjusted the VR for proper charge, polarized it, and all I had to do was mount it on the tractor (cost was about $100). Now it charges at 14+ volts. I'm sure a good automotive electrical shop can do the same for the 6 volt version. I believe the Farmall Cub charging system worked same way originally, and many people have converted them to VRs as well.

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souNdguy

02-17-2005 11:39:48




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 Re: AC mod CA geneerator/requlator in reply to actex, 02-17-2005 06:46:17  
I'm not familiar with the specific genny you talk about.. but gennies in general are pretty simple. The 2 brush gennies use a resistance switch or regulator to vary field current. A circuit units have a field that is internall hot.. that is.. tied to the armature. The field is then grounded via the regulator.. or the resistor to ground. You would full field this genny by momentarilly grounding the field tab on the genny and it would give you max charge.
The other 2 brush setup is a type B circuit. It's field is internally grounded, and field power comes from a regulator. You full field this genny by momentarilly applying battery power to the field tab on the genny.. producing max output. A 3rd brush genny is very similar to B circuit, as the field is internally grounded, and the 3rd brush provides field current. Turning the dial onthe 3rd brush changes its position, and thus how much power it energizes the field with. 3rd brush units are east to convert to 2 brush/B circuit gennies by disconnecting the field from the 3rd brush, and instead, connecting it to the field terminal on an appropriate B circuit regulator. Then the regulator controlls the power to the field. The regulator will have a built in cutout relay. For instance.. regulators for a ford NAA or hundred series tractor would be an example of a 6v B circuit regulator. Remember any time you work on a genny.. or add a regulator.. you need to polarize them.

For instance.. the ford gennies I'm familiar with polarize by:

Acircuit: jumper BATT and ARM or (GEN) on the regulator when battery is hooked up but tractor not running.

BCIRCUIT: Jumper BATT to FIELD momentarilly whioe tractor is not running.

Many gennies polarize similar.. but do read the polarization procedure for your specific regulator.. etc.

Soundguy

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actex

02-17-2005 13:02:11




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 Re: AC mod CA geneerator/requlator in reply to souNdguy, 02-17-2005 11:39:48  
the gen I have has a third brush which is not adjustable. One brush is tied to the frame, one brush to the armature terminal, and the other to the field winding. The regulator that they sent does not have any instructions but is labled 6v pos gnd. would it be an A circuit or B circuit.



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souNdguy

02-17-2005 19:56:51




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 Re: AC mod CA geneerator/requlator in reply to actex, 02-17-2005 13:02:11  
Does your genny have a field terminal?

Most 3rd brush gennies don't.. but some do.

circuit type is basically how the field is internally wired and powered.. A field that is internally grounded.. and recieves power via a 3rd brush or regulator is B.. A field that is internally hot and requires ground via a resistance switch or regulator is A circuit.

Soundguy



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steve(ill)

02-17-2005 19:43:05




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 Re: AC mod CA geneerator/requlator in reply to actex, 02-17-2005 13:02:11  
the generatorhas two terminals "A" and "F". the regulaltor has three terminals "G", "F", and "B". the A (armature) goes to G (generator), the F (field) goes to F (field). the B terminal on the rregulator is the battery terminal, it goes to one side on the amp meter, the other side of amp goes to the battery negative terminal. the battery positive terminal is grounded.---- after wiring, touch the B and G terminals together for 1 second and get a spark.... you are now polarized and ready to start motor. make sure the regulator is grounded good to the tractor motor or frame.

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actex

02-18-2005 10:50:43




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 Re: AC mod CA geneerator/requlator in reply to steve(ill), 02-17-2005 19:43:05  
My regulator has an F term. a B term an L term. and a terminal underneath that is not designated, my generator has an A & F terminal, How should I hook it up?



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steve(ill)

02-18-2005 18:31:34




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 Re: AC mod CA geneerator/requlator in reply to actex, 02-18-2005 10:50:43  
the 4 pin regulator is an older version of the 3 pin. when tractors forst were changed from 6 to 12 volts they had 4 terminal regulators. the "L" is actually a 12 volt terminal, just like the "B", but the "L" must not have voltage when the tractor is shut off, so the L comes from the ignition switch or "ON" switch. the "B" is 12 volts all the time. YOu can switch to a newere regulator if you wish, or use the old 4 pin style, but you need an on - off 12 volt switch for it. the terminal on the bottom is therfore the G if F and B are on the top. 3 pin types will have all terminals on the side next to each other.

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