How to tell 6V from 12V system

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calebpalmer86
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Re: How to tell 6V from 12V system

Postby calebpalmer86 » Fri Jan 24, 2020 4:19 pm

Oh! I guess I should have looked a little closer before posting this one. Ha! Thanks!

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Re: How to tell 6V from 12V system

Postby Slim140 » Fri Jan 24, 2020 4:37 pm

It appears your alternator is missing.
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Don McCombs
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Re: How to tell 6V from 12V system

Postby Don McCombs » Fri Jan 24, 2020 4:58 pm

You have enough posts now that you can view or download the Parts Catalog and Operator's Manual for your Cub. In the upper left corner of the page, click on Quick Links. Then click on PDF Manuals. Next, click on Farmall Cub. That will get you access to manuals that will help you understand what you have, what's missing and how to go about fixing it.
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tmays
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Re: How to tell 6V from 12V system

Postby tmays » Fri Jan 24, 2020 5:51 pm

calebpalmer86 wrote:What is the gray piece in the lower left of the first picture?

I believe you’re referring to the starter and it’s switch on top attached to it
Thomas

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Don McCombs
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Re: How to tell 6V from 12V system

Postby Don McCombs » Fri Jan 24, 2020 6:43 pm

tmays wrote:
calebpalmer86 wrote:What is the gray piece in the lower left of the first picture?

I believe you’re referring to the starter and it’s switch on top attached to it

Thomas is correct. And it is a 6V starter.
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Glen
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Re: How to tell 6V from 12V system

Postby Glen » Fri Jan 24, 2020 6:45 pm

Hi,
Here is some info about what electrical systems the Cubs originally had.

IH changed the Cub electrical system during 1950.
If the serial number of your Cub is 115402 and below, it originally had the electrical system in the pic below, from the 1949 Cub operator's manual.

http://farmallcub.com/rudi_cub/www.clea ... age-33.jpg

If the Cub is serial number 115403 and above, it originally had the system in the pic below, from the 1955 Cub operator's manual.

http://farmallcub.com/rudi_cub/www.clea ... age-39.jpg

In your pics it looks like the Cub has a Battery Ignition unit. They came out at serial number 115403, but some Cubs that had magnetos have had them put on.
The generator is gone in your pic, it goes on the bracket on the engine. It has a belt that runs it, the pic doesn't show if the belt is there.

The Cub operator's manual will help you learn about maintenance that the Cub needs.

Below is the 1955 Cub operator's manual. The experts on here recommend people read it. It has lots of info about operation, maintenance, and lubrication. There is a table of contents on page 1.
It shows how Cubs originally looked in it. The lube section begins on page 14.

http://farmallcub.com/rudi_cub/www.clea ... index.html

They have said on here that IH didn't make a new manual every year.

Cubs made before mid 1964 originally had 6 volt, positive ground electrical systems.

The Touch Control fluid talked about in the manual was changed later to Case IH Hy-Tran fluid. It is sold at Case IH dealers.

I would check or change all the oils before using the Cub. Using it with low oil in a gear housing can damage the parts in the housing.
There are 3 separate gear housings, with 3 separate oil levels to check, in the rear area of a Cub, the transmission, and 2 final drives.

The transmissions in Cubs commonly get water in them, from rain, or condensation inside the housing over time. :)

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Re: How to tell 6V from 12V system

Postby calebpalmer86 » Fri Jan 24, 2020 11:38 pm

Thanks so much. Since there is a 12V coil on there, is it safe to assume that the tractor has been converted over to a complete 12V system? Am I safe to get a new alternator and put onto the tractor? My goal right now is first to make sure that the motor is free, or able to be freed. After that I want to see if it will turn over. That's why I'm trying to start sorting out the electrical system. Thanks again everybody for answering my beginner questions!

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Re: How to tell 6V from 12V system

Postby Slim140 » Sat Jan 25, 2020 7:27 am

Since you have a 12V coil, and a ballast resistor reducing it to 6V to the points, I think you’ll be fine to get an alternator and wire it with a 12V battery. You don’t want 12V going to your points on this one, they won’t last long and your ballast resistor has you covered there. There’s a wiring diagram somewhere on here.
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calebpalmer86
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Re: How to tell 6V from 12V system

Postby calebpalmer86 » Sat Jan 25, 2020 7:48 am

Great! Any recommendations on the best/cheapest alternator? I'm seeing that the mount is also important, so seems like the best bet may be to buy a kit. I'm not interested in making a mount myself.

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Don McCombs
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Re: How to tell 6V from 12V system

Postby Don McCombs » Sat Jan 25, 2020 7:57 am

I would recommend that you determine whether the engine is free before spending any money on the electrical system.
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Re: How to tell 6V from 12V system

Postby Slim140 » Sat Jan 25, 2020 8:19 am

I agree with what Don said but when you do get ready for an alternator I’ve had good luck with this one.

https://www.dbelectrical.com/products/c ... 12180.html
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Re: How to tell 6V from 12V system

Postby staninlowerAL » Sat Jan 25, 2020 8:22 am

Don McCombs wrote:I would recommend that you determine whether the engine is free before spending any money on the electrical system.

Agreed!!!! You can get the engine running w/o a gen or alternator. There's some posts about what to check/do to a "new to you" tractor to get running: if the engine will turn over either with a battery installed or with a hand crank you can check the compression, prime the oil pump, check for firing at the points/plugs, fuel flow delivery/quantity/carb condition/starter condition and operation, etc. You only need a 12v battery or hand crank to investigate.
EDIT: Your zipcode indicates North GA, The first CUBFEST of the year is in Sneeds FL next month. If you can attend, you will greatly benefit from the activity to learn more about your cub. If you could bring it to the event there will be lots of help and knowledge to get it running. Contact Mr. E who is the host for the event.

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Re: How to tell 6V from 12V system

Postby MiCarl » Sat Jan 25, 2020 9:03 am

Eugene wrote:That gray piece just below the coil is a ballast resister. It's used to drop 12 volts down to around 6 volts. And used with a 6 volt coil when the tractor has been converted to 12 volts.


Shouldn't a 12V coil be internally resisted and not require the external resistor?
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calebpalmer86
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Re: How to tell 6V from 12V system

Postby calebpalmer86 » Sat Jan 25, 2020 9:35 am

Yeah, like I said I plan to make sure the engine is free, or can be free before I spend any money on parts. One problem is that (In true Paw Paw fashion) the hand crank is missing, so attempting to free the motor that way isn’t an option. I may have to take the head off and tap the pistons.
Shane N, is there a mounting bracket that fits with that alternator you’d recommend?
Thanks everybody!

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Re: How to tell 6V from 12V system

Postby Eugene » Sat Jan 25, 2020 9:38 am

MiCarl wrote:Shouldn't a 12V coil be internally resisted and not require the external resistor?
12 volt coils can be purchased with and without an internal resister. Just depends on how the vehicle manufacturer designed there ignition system.
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