Basic cub questions I cant find answers to via searching

T

TurboRoadster

Well-known member
Me again, sorry for the constant bother, I got a 67 cub lo boy 3 days ago and have already split it for new clutch and main seal etc etc. while its all naked, I want to install an alternator. I have searched and searched, used various key words and I still cant find a helpful schematic to a 12 v, 3 wire alternator conversion (I have a 3 wire on the shelf already).
I also read to much I guess and now am confused, does my tractor have a magneto and if it does, do I need to change to a distributor when I install alternator? doesnt make sense to me but I'm a tractor noob and figured i would ask the experts.
thanks again
Timothy
 
It's very unlikely that your 67 LoBoy has a magneto. It would have come from the factory with 12V battery ignition.

This is a magneto...
mvc_5877s.jpg


This is a distributor...

mvc_5451s.jpg
 
https://www.google.com/search?q=farmall ... lra8mHI%3D

Above wiring diagram for a 3 wire Delco alternator.

I would spend the $30- and get a single wire Delco clone alternator. Much easier to wire.

When you change to the 12 volt alternator you will need a ballast resistor or coil with internal resister, amp meter, and upper and lower alternator bracket. No need to change the starter. Conversion cost is $100- to $120-, not including the battery. But the good thing is that the conversion cost is frequently cheaper than a new regulator and generator repairs.

Edit: Quite a number of posts on this site for how to do the 12 volt conversion.

Another edit: All my tractors have been converted to a 12 volt alternator. In the past 15 or 16 years I have only had one alternator fail and that was on a tractor that had been converted before I purchased it. Yes, I'm a 12 volt conversion fan.
 
Eugene":2d7d1ihw said:
. . . When you change to the 12 volt alternator you will need a ballast resistor or coil with internal resister, . . .
Click to expand...
Not applicable, already a 12-volt system
 
Here is a link to the correct wiring diagram for a Factory Cub with a 3-wire alternator. IH never released a proper diagram so I adapted one.
http://www.farmallcub.com/fcman/dow...ams/12 Volt/Cub 248 125-up 12V alternator.pdf

I am putting a small Denso 3-wire on my tractor now. You need to install a diode or a ballast resistor in the system to be able to shut the engine off.

This post has a picture of my alternator. One-wire is easier but I wanted to try this little one made for a Kubota in the hope that it is designed to work at lower RPMs- not that output is much of an issue. http://www.farmallcub.com/phpBB2/viewtopic.php?f=1&t=48905&p=721503&hilit=starting+on+the+50#p721503
 
You must log in or register to reply here.
Back
Top