Regulator versus Cutout on a 1949 Cub

[stevenforehand]

Hi All!

I'm diving into my newly acquired 1949 cub. The lights are not working an the battery is not charging. Part of this issue is a bad light switch (which I have a replacement). However, i was noticing the generator has a regular mounted on top with 3 terminals on front and one under it. It seems it is not wired correctly as the last terminal on the left does not have a wire attached.

My question is can I replace the regulator and rewire the tractor according to the diagrams found on this site? All the wires probably need replacing so a rewire is in order in any case.

Thanks!

[Eugene]

Check the unattached regulator terminal. There will be a stamped letter on the terminal. L indicates load and is the same as the B, battery terminal. Some Cub wiring schemes used and some didn't use the "L" terminal.

Consider a 12 volt single wire alternator. Search function, above. Lots of posted topics on the subject.

[stevenforehand]

It does have an L on the far left terminal of the regulator.

The tractor has been rewired at some point but needs a rewire as there are some wires in bad shape. I guess my question is can I completely rewire the tractor using the new light switch and new voltage regulator? I have a spool of 12 gauge solid wire. I see most like to use 10 gauge. Would 12 solid wire be too light?

Also, you mentioned an alternator. Is there such a thing as a 6v alternator as a direct replacement of the generator or do I have to go full 12 volt conversion (which I'd prefer not to do)?

Thanks!

[Eugene]

I would use 10 gauge multi-strand wire through out. But, 12 gauge multi-strand would suffice for some applications on the Cub.

Alternator. Yes there are 6 volt alternators. If you haven't done so, read the numerous topics on conversion to a single wire 12 volt alternator.

The other day I paid $79.23 for a voltage regulator for a narrow framed Cub Cadet, combination starter/generator. $79.23 is almost twice what I paid for a 12 volt single wire alternator.

[John *.?-!.* cub owner]

Before you get too carried away polarize the generator.

[karlibob]

What is the difference between a cut out and a voltage regulator?

[John *.?-!.* cub owner]

What is the difference between a cut out and a voltage regulator?

A cut out has a single relay in it to disconnect the battery from the generator when engine stops, or when generator stops charging. The charge rate (for Farmalls) is controlled by a high Lo charge setting on the light switch through the F terminal of the generator. A regulator has either 2 or 3 coils depending on it's application and controls the charge itself, dependent on battery voltage. Farmall cutouts have 3 terminals with the F terminal normally only used on stationary engines. A regulator has 4 terminals with the F term connecting to the F of the generator to control charge rate

[Jim Becker]

. . . Farmall cutouts have 3 terminals with the F terminal normally only used on stationary engines. . . .

F terminal is also used on tractors with starters but no lights.