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Allis Chalmers Discussion Forum
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wd generator wiring

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msmyers1

08-25-2007 10:02:39




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I am working on a neighbors wd with an old style headlight switch to control the generator. The gen. has been rebuilt but will not charge. We cannot find the proper switch to replace the old one. The cut out relay will not stay energized. Have cleaned all grounds and power connections. I'm not sure how to wire the gen.so it will charge. Is the best thing to do is to install a regulator? Whenever I hook the field wire up the gen. tries to motor. Does anyone have any suggestions? Thanks

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Jim Guarino, Agri-Service

08-26-2007 20:28:15




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 Re: wd generator wiring in reply to msmyers1, 08-25-2007 10:02:39  
If the switch box that the light switch mounts to, is not grounded to the battery box, the generator field will not be grounded. A common problem is that the retaining screw for the switch box, will be loose in the battery box hole. If you need one, I do stock the 3 position switch also.



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m.myers

08-27-2007 08:28:34




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 Re: wd generator wiring in reply to Jim Guarino, Agri-Service, 08-26-2007 20:28:15  
Thanks, I'll check with the owner of the tractor to see if he wants me to order a new switch or stay with what we have and let you know.



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steve(ill)

08-25-2007 19:15:39




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 Re: wd generator wiring in reply to msmyers1, 08-25-2007 10:02:39  
the generator A terminal goes to the cutout, ohter side of cutout to the amp meter. the F terminal goes to the light switch.---- to test, ground the F terminal to the tractor frame, if that works, the light swith is bad. next jumper around the cutout so the A terminal goes straight to the amp meter. if that works, the cutout is bad.--- if you ground the F and put a voltmer across the A and F terminals of the generator you should see higher than battery voltage (7 volts).

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msmyers1

08-26-2007 10:24:47




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 Re: wd generator wiring in reply to steve(ill), 08-25-2007 19:15:39  
Thanks to everyone for your replies. I didn't have a schematic in the owners manual but did find a great article from this web site on the three brush generator. I grounded the field wire for now and adjusted the 3rd brush to lower the output amps until I can get a new light switch. The old guy that owns the tractor doesn't drive it much so I should be alright for now. Again thanks for all your help.

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msmyers1

08-25-2007 18:51:01




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 Re: wd generator wiring in reply to JMS/MN, 08-25-2007 17:25:20  
Thanks, I'll check it out tomorrow and let you know how I made out.



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