12v or 6v?

Tue Jul 09, 2013 3:55 pm

:help: Hi everyone. Im new to this forum. I have owned a cub for a couple of years now. I bought this 1958 Farmall cub as a project but hadnt had time to work on it. I finally have time now and Im trying to get it running. The guy who I bought it from had a 12v battery hooked up to it. Cant that mess the whole system up if you run a 12v battery on a 6v system? If I did mess it up, I need some help on what to replace and what to rebuild because Im not real sure. any help is greatly appreciated.

Re: 12v or 6v?

Tue Jul 09, 2013 4:40 pm

You will need to check to see if the generator is 6 or 12 volt or been converted to 12 volts with an alternator.

A lot of Cubs have been converted to 12 volts with an alternator.

The 12 volt battery will not hurt the 6 volt starter.

There is another recent post titled where to begin. Lot of good information on an initial engine start up.
viewtopic.php?f=1&t=79537

Re: 12v or 6v?

Wed Jul 10, 2013 7:18 am

Welcome to the forum.....Good place to start exploring your cub.....Check it out as Eugene mentioned, by the time your done you'll have made yourself familiar with your electrical system.....

Re: 12v or 6v?

Wed Jul 10, 2013 9:41 am

Hello and welcome to the forum. This is a great place (great members too) to learn all about your Cub. Post some pictures and if you come up with some specific things you need help with - just ask. No such thing as a dumb question.

Re: 12v or 6v?

Wed Jul 10, 2013 10:05 am

A 12V battery can't really hurt the 6V system on your Cub.

The starter should only be run momentarily, no more than 30 seconds at a time. It handles 12V just fine.

It won't hurt the generator. Odds are the generator wasn't working in the first place, which is why it has a 12V battery now.

6V lights will burn out on 12V, but they probably don't work either.

If the tractor has battery ignition, the coil may still be 6V. If so it needs a ballast resistor added, or it needs to be replaced with a 12V coil. This may already be done.

Are you having problems? If not, there's no reason to proactively "rebuild" anything.

Re: 12v or 6v?

Wed Jul 10, 2013 12:03 pm

The cub wont start.I Just had the starter rebuilt and when I put it back on, It started fine and ran okay 2 times

Re: 12v or 6v?

Wed Jul 10, 2013 12:38 pm

It might be a bit of a drive for you (not sure what you consider far) but bring it up to the house and we'll get her going and running good and have you back home by night. We're just the other side of Tuscaloosa, AL off 20/59 and would be glad to help. Got lots of parts and implements too. You can Private Message (PM) me if you wish.

Re: 12v or 6v?

Wed Jul 10, 2013 4:45 pm

Thanks AL farmallboy. I'll think about it seriously.

Re: 12v or 6v?

Wed Jul 10, 2013 6:24 pm

I got the cub to turn over, but it wont fire. I cant seem to find why it wont fire. it was the cables causing it not to turn over.us

Re: 12v or 6v?

Thu Jul 11, 2013 5:10 pm

What did you do about the cables? If that was the problem, check that all your connections are clean. It may be that the starter is taking all the available juice and there's not enough for the ignition system. Check the quality of your spark. If spark is bright blue, then check timing and that the plugs wires are installed for the correct firing order.

Re: 12v or 6v?

Thu Jul 11, 2013 9:50 pm

G'day to you :D

One of the best things you can do to familiarize yourself with your Cub even if you have some mechanical skills is to read the Owner's Manual. This one - McCormick Farmall Cub and International Cub Lo-Boy Operator's Manual 10-1-59 will suffice for your '58 Cub. You might want to check the Blue Ribbon Service Manual's as well.

There are lots of resources for our members at the links below:

Image to Farmallcub.com :big smile: Forum Family. And you have come to the right place for all things Cub related. If you click on the Site Rules, Regulations, & Important Information, it will point you to :arrow: the Welcome Wagon wherein you will find links to many useful sites and topics. One of the most important resources are Owner's Manuals, Parts Catalogs and Service Manuals. The Cub Manual Server is the home of the jpg versions and the PDF Manuals -- well the pdf's of course :wink: Enjoy!.

Re: 12v or 6v?

Fri Jul 12, 2013 12:49 am

Thanks you guys. I bought some new plugs and plug wires and will install them tommorow. I'll keep everyone updated.

Re: 12v or 6v?

Sat Jul 13, 2013 8:37 am

I put the new plugs and wires on the cub. It still wasnt the problem.