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D

Dr. CHIP

Member
i recently bought a case d that had a 12 volt battery pos ground with a resistor ahead of the coil. It starts good but the battery wont charge. Ive ordered a 12 volt regulator to use with the original generator. Do I need a new generator? I read some where that all I need to change is a regulator(6 to12 volt).
 
Are you sure it is pos ground. Most 12 volt stuff is neg ground. That is the starting point then deal with regulators and such.
 
Well first thing , that is a 6 volt tractor. U got a 12 volt
battery in it now. So to keep things simple u need to
install an alternator to replace that 6 bolt stuff. OR use a
6 volt battery and then check the reg and generator out.
Them tractors start so easy with 6 volt I would keep if
that way. But its ur call.
 
I respectfully disagree. Many Agricultural engines and some vehicles remained Positive ground when switched to 12v. My 48 MD was for sure Positive ground as were generator equipped Farmalls and generator equipped IH XXX series. Jim
 
And also these tractors came out with a magneto. So a 6 volt battery will last a very long time starting this engine if its tuned up properly. Remember once the tractor is running there is no more battery drain. Plus they were 6 volt neg ground from factory is what they say on here. My D is pos 6 volt ground so I cant say either way. I was taught 6 volt systems are pos ground. And I have never run into a neg ground tractor.
 
Its entertaining when somebody states that there is a pair of black 6 buckle overshoes with leather laces on their feet and some on here insist that they are wearing brown wing tip loafers with Velcro.
 
(quoted from post at 21:28:52 04/07/23) Its entertaining when somebody states that there is a pair of black 6 buckle overshoes with leather laces on their feet and some on here insist that they are wearing brown wing tip loafers with Velcro.
Click to expand...
:D :D Yup!
 
D and S series Case tractors were six volt negative. Replacement 6 volt neg ground regulators are nearly impossible to find. Many tractors have been changed to six volt positive for that reason.

I'm thinking about changing my SC to 6v positive so I can find a reasonable priced regulator.

Brillmans show one 6v neg regulator priced over $110.
 
You can get positive or negative ground
regulators. If you end up replacing the
regulator trying to straighten out what you
have, be sure you get the right regulator
you need.

One reason I hate conversions, is figuring
out what somebody did before you. And they
might not of did it right. And they might
of also just done a partial conversion
(just rigged it up best they could to get
12v start).
 
(quoted from post at 21:02:34 04/07/23) I respectfully disagree. Many Agricultural engines and some vehicles remained Positive ground when switched to 12v. My 48 MD was for sure Positive ground as were generator equipped Farmalls and generator equipped IH XXX series. Jim
Click to expand...
Yep. My 61 Minnie Mo was 12V positive ground.
 
I've never seen a 6v negative ground but I'm not familiar with Case, not many around here. I keep my COOPs 6v and they start fine. Early 12v
systems were also positive ground. I'm not sure about a 6v generator being able to produce the 13-14 volts needed to charge a 12.
 
Racine built Case tractors such as the D and S series were a 6 volt negative ground system equipped with a magneto when they left the factory. Rock Island built tractors such as the VAC were 6 volt positive ground when they left the factory. Since you stated yours has a distributor and coil, it has been changed from original and the electrical system could have been changed as well. It would probably be best to redo the electrical systen to your choice of 6 or 12 volt so you know what you have and make it work correctly.
 
Many Agricultural engines and some vehicles remained Positive ground when switched to 12v.

Best I recall Deere kept POS ground even at 12 volt UNTIL they switched from gennys to alternators

John T
 
(quoted from post at 06:27:37 04/08/23) Before you end up confused , tell us part number and brand of generator.
Click to expand...
cant make out the number very well but I think it is M909B-5 90. Its an autolite.
 
(quoted from post at 16:20:23 04/08/23) Racine built Case tractors such as the D and S series were a 6 volt negative ground system equipped with a magneto when they left the factory. Rock Island built tractors such as the VAC were 6 volt positive ground when they left the factory. Since you stated yours has a distributor and coil, it has been changed from original and the electrical system could have been changed as well. It would probably be best to redo the electrical systen to your choice of 6 or 12 volt so you know what you have and make it work correctly.
Click to expand...
Yea Im just not sure what all to change. I just read where someone claimed the gen. puts out enough that changing the regulator is all that is needed, but darn if I can find it now. There is an old wire running from the regulator to other side of tractor in the switch area but its broke off. I just want to get it so battery will charge.

This post was edited by Dr. CHIP on 04/08/2023 at 06:29 am.
 
I agree. All Olivers with generators were positive ground, 6 and 12v. They switched to negative ground when they went to alternators in about 65 or 66.
 
Dr Chip, There is a Auto Lite GBM4809BS
used on D's 1949-51, that would be 6
volt. I don't know if a 12 volt regulator
would make generator charge 12 volts.
There are a few who claim it will. I think
you can install 12 volt field coils to
make it charge 12volt.
'
 
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