Cub positive ground question

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Welderman2020
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Cub positive ground question

Postby Welderman2020 » Wed May 10, 2023 5:10 pm

So couple days ago I got a sweet deal on an old Cub with a sickle bar Mower and a push blade for a price I couldn't pass up it's still a very solid tractor but I'm having some issues with the ignition and what I was wondering was did the Cubs with a battery ignition were those positive ground or just normal negative ground just trying to get all the wiring fixed on it cuz it's kind of a mess also it was converted to 12v if that helps.

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ricky racer
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Re: Cub positive ground question

Postby ricky racer » Wed May 10, 2023 6:27 pm

What year is your Cub? Older Cubs came with a 6 volt system and a positive ground. Many Cubs were converted to 12 volt due to various reasons. I've never owned a converted Cub so I'm not much help here but others will be along shortly to offer wisdom. In the mean time you can use the search function and probably find the answers you are looking for.
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Re: Cub positive ground question

Postby Cubfriend » Wed May 10, 2023 7:00 pm

Most Cubs that have been converted to 12V with an alternator are also converted to negative ground. However there is a company that makes a positive ground alternator. There are not too many in use.
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Re: Cub positive ground question

Postby Eugene » Wed May 10, 2023 7:10 pm

6 volt system - positive ground. 12 volt system - negative ground.

Couple questions. Does your alternator or generator charge the battery? Which one do you have?
Do you have a magneto or a magneto conversion? Battery powered ignition system?
I have an excuse. CRS.

Welderman2020
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Re: Cub positive ground question

Postby Welderman2020 » Wed May 10, 2023 7:23 pm

Battery powered ignition, with a single wire alternator, and a 12v coil, the thing that's got me messed up is that there is a capacitor screwed down to the coil mount and hooked up to the battery side of the coil. And there's the capacitor inside the distributor housing, I don't recall ever needing or seeing an extra capacitor on things I've worked on in the past. Just trying to get this beast to fire up. I've got good compression got brand new spark plugs brand new spark plug wires everything on the inside of the Distributors brand new IE points condenser new distributor cap yeah I'm just at a loss and what to do oh and the points are gapped correctly too so I'm thinking it's got to be somewhere in the wiring cuz I can't get the thing to fire but it did shock the hell out of me once when I was messing with it

Welderman2020
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Re: Cub positive ground question

Postby Welderman2020 » Wed May 10, 2023 7:36 pm

I can't figure out how to up load a picture for the life of me

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Re: Cub positive ground question

Postby Eugene » Wed May 10, 2023 7:45 pm

Welderman2020 wrote:There is a capacitor screwed down to the coil mount and hooked up to the battery side of the coil.
It's not a capacitor, it's a ballast resister. The ballast resister drops the battery voltage to around 9 volts at the points. Keeps the points from burning up.

Double check the spark. Coil wire, distributor end about 1/4" from a ground/engine block, crank engine over. Good hot continuous spark?

Static time the engine. Should be a video on this site showing how to.

Compression tested with a tester? Cub's siting for a good length of time usually have stuck valve(s).
I have an excuse. CRS.

Welderman2020
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Re: Cub positive ground question

Postby Welderman2020 » Wed May 10, 2023 9:32 pm

Hey fellas, Figured it out. Got her purring like a kitten, had a wire crossed up. Thanks much for the input.

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ricky racer
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Re: Cub positive ground question

Postby ricky racer » Wed May 10, 2023 11:21 pm

Welderman2020 wrote:Hey fellas, Figured it out. Got her purring like a kitten, had a wire crossed up. Thanks much for the input.

:thumbsup: :thumbsup:
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Re: Cub positive ground question

Postby SamsFarm » Thu May 11, 2023 12:31 am

Welderman2020 wrote:I can't figure out how to up load a picture for the life of me



Try here! ⬇️

https://farmallcub.com/phpBB2/viewtopic.php?f=20&t=77172&sid=e9af450cc6eec0504866b44e1253cfe8


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