Voltage reg or cutout

[5 Forward]

I have a 48 Cub Ser# 57351. The generator model is 1101355 and has a 3-position light switch. The ignition was a Fairbanks-Morse Mag that I converted to 6-volt battery ignition. The generator was not connected due to a deteriorated wiring harness. The voltage reg/cutout is a saddle type with 3 connections on the front side and one on the back with two coils with numbers stamp in ink 4KD and 1409 6v pos. On a visual inspection the generator looks freshly rebuilt and the reg/cutout is fairly new. The previous owner was using a 12-volt battery for starting. My question is this the correct reg/cutout. I have just purchased a wiring harness from Brillman for the early cubs. The wiring harness calls for a 4-position light switch.
Could it be on this reg just connecting the wires from the harness that it becomes the cutout relay? Just want to make sure before connecting it all together that it doesn't fry the generator or the wiring harness.
Any help to get this corrected would be greatly appreciated.

 

[IHPWR]

check to make sure your gen/cut out or volt reg are matched to each other. Pull the inspection plate from gen and count number of brushes, then pull cover on reg to see how many coils it has. A 3 brush gen should go with cut out which will have one coil. A 2 brush gen will go with volt reg which will have 2 coils under the cap of reg. I am assuming this is a 6 volt positive ground system. There are wiring diagrams for this if you dont already one. Not entirely sure about the light switch

 

[tst]

the 4 post switch was used to control the cut out relay, 3 post was for regulator systems, post a pic of of your generator regulator to see if its a regulator or cutout

 

[Glen]

Hi,
The Delco 1101355 generator is the correct gen for a 1948 Cub. It was used with the cutout, or Relay, IH called it, which was mounted on top of the gen.
The Relay has 3 posts for connecting wires to.
The voltage regulator has 4 posts.
It sounds like someone changed the Relay to a voltage regulator, mounted on top of the gen.
That style of regulator was not used by IH on a Cub, it's not in the Cub parts manual.
The system originally uses the 4 position charge and light switch to control the charge rate.
It was before there were voltage regulators on Cubs, you had to choose the charge rate yourself.

Use of the 4 position switch is in the 1949 Cub owner's manual beginning on page 34.

I don't know if the reg will work as a Relay by leaving a wire off of it, I've never tried it.

The voltage regulator is a more modern item.
You could connect the reg so it functions as a reg.
There is no wiring harness premade to connect to the regulator on top of the gen, that I have seen, since IH didn't use that style of reg.
Connect the reg using the wiring diagram for a Cub with a reg, and it should work.

The 3 position light switch was used beginning in mid 1950 - mid 1958.
It is for only the lights.
Mid 1950 is when the voltage regulator came out on Cubs.

check to make sure your gen/cut out or volt reg are matched to each other. Pull the inspection plate from gen and count number of brushes, then pull cover on reg to see how many coils it has. A 3 brush gen should go with cut out which will have one coil. A 2 brush gen will go with volt reg which will have 2 coils under the cap of reg.

The 3 brush generator was used with the voltage regulator also.
The Cub parts manual shows the 3 brush gen was used up to Cub serial number 221292, which was made in mid 1962.
Then IH changed to a 2 brush gen. The 2 brush gen is vented and has a fan at the front pulley.

All of them I have seen that were made in the 1950's after serial number 115403, when the voltage regulator came out, have the 3 brush gen and a voltage regulator.

Below are pages from the Cub parts manual showing the 3 brush gen.
The serial numbers are at the top of the pages.

Number 15 in the pic are the brushes.
15 in the description says it has 3 brushes.

http://www.farmallcub.info/manuals/cub_ ... 008-05.jpg

http://www.farmallcub.info/manuals/cub_ ... 008-06.jpg

Below are pages showing the 2 brush gen.

Number 6 in the pic are the brushes.
6 in the description says it has 2 brushes.

http://www.farmallcub.info/manuals/cub_ ... 008-07.jpg

http://www.farmallcub.info/manuals/cub_ ... 008-08.jpg

 

[Jim Becker]

Everything Glen said is correct. Here is a bit more.

There were regulators made to replace the old cut-outs. If your regulator was built for saddle mounting on the generator, that is probably what you have. If you have that sort of regulator conversion, it should work fine. With that, you no longer require the 4-position switch. Do your wiring as original for a cut-out system with these changes:
- The original wire from the generator "F" to the light switch can remain unhooked on both ends.
- Make up a short wire and attach it from the generator "F" to the regulator "FLD"(or however marked).

 

[5 Forward]

I am trying to add pictures of what I have

 

[Glen]

Thanks for the pictures.
I don't see the 4th post you said it has.
Some voltage regs have 3 posts.
The original ones IH used have 4 posts, one is a L post.
Some regs for other brands of equipment have no L post.

If it has no L post, connect the wires it uses and see if it works.

 

[Jim Becker]

Can't say for certain, but that looks to me like one of the conversion regulators I mentioned earlier. I think that even with an L terminal, you can ignore it. Wire the others as already said.

 

[5 Forward]

There is a small wire opposite these three terminals comes out under the bottom. A small wire that was attached to the A-terminal on the generator. The wire can be vaguely seen top left of the top photo. The front terminals from left to right L, BAT, and F.
Thanks for the replies, it is beginning to make some since.

 

[Glen]

Hi,
Below is the wiring diagram for 6 volt positive ground Cubs with a voltage regulator.

The L post powers the Battery Ignition unit, and lights.
It doesn't have to do that if those are wired another way on your Cub.

If your Cub has been changed to the 3 position light switch, it should have a fuse for the lights, the 3 position switch has no fuse on it for the lights.
The 4 position switch has a fuse for the lights built on the rear of it.
The systems with a 3 position switch have a separate fuse for the lights in a fuse holder at the bottom hole in the dash.
TM Tractor has the fuse holder, or you can put in a fuse in the light power wire.

Below is a page from a Cub operator's manual showing the dash with the fuse holder at the bottom hole.

http://farmallcub.com/rudi_cub/www.clea ... age-05.jpg

 

[5 Forward]

Thanks everyone for the info. You have been a tremendous help.

5 Forward