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Allis Chalmers Discussion Forum
:

Discharging

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trc10

10-18-2007 16:24:42




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My B shows discharge on the ampmeter when the field is attached to the light switch. If I attach the field to ground it shows charge. I'm thinking the switch is bad. How can I regulate the charge rate if I bypass the light switch? Is there some type of regulator that will work? If so what do I need?

Tom




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trc10

10-19-2007 07:14:09




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 Re: Discharging in reply to trc10, 10-18-2007 16:24:42  
Thanks for all the replies, I'll work on the ground situation and see what happens.
Tom



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Steve in NJ

10-19-2007 03:53:32




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 Re: Discharging in reply to trc10, 10-18-2007 16:24:42  
That's usually the most popular problem with the 3 pos. switch. No ground, no charge. The switch controls the amount of ground to the Gennie. Make sure the mounting area in the Ammeter box is clean and free of paint, corrosion, or rust. Once you get the switch grounded correctly, if it still doesn't charge, you may have a problem internally. We have an exchange program on the OEM 3 pos. switches if ya need one, but it's probably just a ground problem...
Steve@B&B

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John T

10-18-2007 19:37:42




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 Re: Discharging in reply to trc10, 10-18-2007 16:24:42  
First thing Id try is see if the light switch itself has a good case ground to the tractor cuz if not field current cant flow through it or its resistor (if its okay???) to ground i.e. NO CHARGE

If the switch has a good ground it ought to at least charge in the High Charge setting cuz thats there even if its field resistor were bad. If its grounded okay but wont even allow field current to flow through it in its High Charge setting, then the switch may be badddddddd.

Those switches arent all that expensive and cheaper then changing over to a full fledged Voltage Regulator so test its ground and see if she will ever charge via the switch.

NOTE there MUST be a good wire and good connection from the Gennys Field post up to that switch also ya know,,,,,,insure its good n in place cuz if the switch isnt connected to it she cant work.

The genny will charge highest with its Field post dead grounded but only charge about half with a 2 to 4 ohm or so resistance in series from Field to ground (if youre gonna jury rig it)

John T

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steve(ill)

10-18-2007 18:51:45




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 Re: Discharging in reply to trc10, 10-18-2007 16:24:42  
yep, discharge means no ground on the F wire. the switch grounds the F wire thru the light box case. make sure you have a good ground... to answer your question on charge, the light switch grounds the F wire for full charge and grounds the F thru that 3 ohm resistor for 1/2 charge. you can just put a resistor in the F wire to ground for a constant 2 amp charge.



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Butch(OH)

10-18-2007 17:30:35




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 Re: Discharging in reply to trc10, 10-18-2007 16:24:42  
I asume you tried it with the switch all the way out? (high charge)Before your trash the old system make sure the switch box is still grounded and the switch is grounded to the box. This is easies done with an ohmeter. Lacking that make up a 2' jumper wire with some clips and attach one end to the battery ground and the other end to the switch itself. It is a safe bet that the ground is bad, not the switch, especialy not the high side of the switch..

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