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Allis Chalmers Discussion Forum
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changing g allis from positive ground to negative ground

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Pappy D

12-31-2007 16:46:06




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I have 49 allis g. these orig were positive ground. this one was negative ground possibly because starter at some point was changed to negative ground starter? i don't know. i lost my markings on wires when i sandblasted. am sure positive bat cable went to starter and the wire from starter went directly to one of the generator terminals . can anyone enlighten me as to how to wire the tractor for a negative ground? sure appreciate any help.

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Pappy D

12-31-2007 18:33:42




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 12-31-2007 16:46:06  
thanks guys. but, have u ever heard of a case where the wire off the starter hooks directly to the generator ?really, i'm not making this up and i'm just lost.



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steve(ill)

12-31-2007 20:47:39




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 12-31-2007 18:33:42  
the A terminal on the generator goes to the amp meter. the other side of the amp meter goes to the battery terminal, (which is also connected to the starter terminal). so if you leave the ampmeter out of the circuit, yes, the generator charge wire goes to the starter post... i would use the ampmeter in the line.



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John T

01-01-2008 08:38:16




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 Re: changing g allis from positive ground to negative ground in reply to steve(ill), 12-31-2007 20:47:39  
Steve and Pappy, DO NOTTTTT wire the Generatos A terminal to the ammeter as posted above or to the battery/starter whatever you do. The Gennys A terminal MUST wire to the Cutout Relay and thennnnn nnnnn to the Load (NOT battery/starter) side of the ammeter. If you wire the gennys ARM terminal to the ammeter it will discharge the battery very fast when you turn off the tractor plus the genny will get hot cuz its trying to turn like a DC motor but the belt wont let it turn. The cutout relay is wired there between the gennys A terminal and the ammeter so once the genny stops producuing voltage when the tractors shut down it opens so the battery dont discharge via the genny. But when you start the tractor and he gennys voltage rises it closes so the gennys output can get to n charge the battery.

AGAIN DO NOTTTTT WIRE THE GENNYS ARM POST TO THE AMMETER AS POSTED BUT INSTEAD TO THE CUTOUT RELAY (i.e. do it Just like the diagram shows)

This is simple so dont make it any more complicated, the wiring diagram posted plus my instructions posted below tells you how to wire it and how to convert from Pos to Neg ground

Best wishes, God Bless n Happy New Year to all

John T

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steve(ill)

12-31-2007 18:00:23




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 12-31-2007 16:46:06  
starter dont care if it is neg or pos. use the diagram above, just turn the battery around so the + goes to the starter.. if you have a coil ignition, reverse the wires as the guys said, and on the ampmeter, reverse the wires if it shows discharge instead of charge.. wireing is all the same.



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John T

12-31-2007 17:49:42




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 12-31-2007 16:46:06  
Pappy, Heres the steps if you change a tractor from Pos to Neg ground.

1) Change battery to Neg ground DUH

2) If its a coil ignition swap coils leads i.e. for Neg ground + gets voltage from ignition switch, - wires to distributor.

3) The ammeter leads need swapped or it will read bass ackwards.

4) BEFORE you start iT you MUST POLARIZE THE GENERATOR.

5) The starter will still turn the same direction regardlss of its polarity.

John T

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Joe M(GA)

12-31-2007 17:32:59




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 12-31-2007 16:46:06  
Well here's how it started out, maybe it will help some-
third party image



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Pappy D

12-31-2007 17:56:28




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 Re: changing g allis from positive ground to negative ground in reply to Joe M(GA), 12-31-2007 17:32:59  
joe m(ga) this is the diagram for positive ground as per original from factory< however, mine has been changed to a negative ground. was talking to my brother and he thinks starter has been changed to a negative ground starter rather than positive ground. this diagram shows the wire from starter coming to the ammeter. am almost sure this wire went directly to the generator but not sure which term. think was another wire from volt reg and maybe one more to the generator. starter doesn't make a sound when i pull on it with all the wiring as per orig positive ground method. have been told some of the old timers had different ways to make things work???

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John T

12-31-2007 18:44:16




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 12-31-2007 17:56:28  
Again, the starter still turns the SAME direction regardless of polarity, regardless what they tell you

See my post above for what had to be done if its converted from Pos to Neg ground. Turn the lights or igntion on when shes not runnning and if the ammeter is wired correct it will swing over to - discharge but if it swings to + charge its leads need swapped.

Often the place the SUPPLY side of the ammeter receives its hot batery voltage is where the big battery cable attaches to the starter switch. The ammeters other LOAD terminal feeds voltage to lights n ignition plus wires to the BAT terminal on either a Cutout Relay or a Voltage Regulator

The wirings the same as on a pos grnd diagram EXCEPT the coil leads are reversed as I posted above and the ammeter leads need swapped so it dont read backwards.

Polarize the genny if youre changing battery polarity

John T

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Pappy D

01-01-2008 10:10:30




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 Re: changing g allis from positive ground to negative ground in reply to John T, 12-31-2007 18:44:16  
John T---Joe M(Ga and Steve (Ill)
thanks for ur help> John, i'll heed ur warning and advice. Thanks to all



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chalmersbob

01-01-2008 20:01:21




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 Re: changing g allis from positive ground to negative ground in reply to Pappy D, 01-01-2008 10:10:30  
follow the advice and wire according to the diagram and you will be fine. Bob



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