Re: starter on Farmall C and electrical questions

Posted by dick on January 09, 2001 at 18:00:56 from (199.239.12.58):

In Reply to: starter on Farmall C and electrical questions posted by Jim H. on January 09, 2001 at 08:39:28:

Jim:

Sounds as if you've got kind of a mess. I'd suggest trying a few things before spending a bunch of money:

Starter - the original IH starters were very over-designed, and can be run OK with 12V, and also don't care which way the current goes through them. I'd suggest trying to get it to turn with jumper cables with the starter out of the tractor and either a 6 or 12V battery - just make sure you get good connections to its case and power terminal. If that doesn't work, Bob M's suggestion of replacing the brushes is worth trying before getting more drastic.

Generator - the original IH generators can be used in a 12 V system if you have a 12 V voltage regulator controlling its output (that's what's on my 300U at this point). Try disconnecting the "junk" 12 V battery after you get the tractor running via hand-cranking. If it keeps going, your generator is probably OK. Check and see what the voltage at the disconnected battery terminal is while running (-7 V for 6-volt positive-ground system, etc.).

Ballast resistor - should be one somewhere between the 12 V battery and the coil if you've got a 6 V coil, otherwise the coil's going to get very hot and you'll probably be burning the points.

Final voltage (6 versus 12 volts) - depends upon what you want. As indicated above, the generator and starter can usually be used in either (within reason). Coils and lights do care. Whichever you choose, you need the proper voltage regulator.
A 12 V system gives more margin for starting the tractor.

Hope this is of some use. Good luck.

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