Voltage regulator...

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Don McCombs
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Posts: 17650
Joined: Mon Feb 03, 2003 6:45 am
Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: Voltage regulator...

Postby Don McCombs » Thu Jan 18, 2024 4:07 pm

The resistance coil at the bottom of the switch is the giveaway. It’s a 4 position switch.
Don McCombs
MD, Deep Creek Lake

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Proud Member of Maryland Chapter 39

The best teachers are those who show you where to look, but don't tell you what to see.
A. K. Trenfor

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Glen
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Posts: 6251
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Voltage regulator...

Postby Glen » Thu Jan 18, 2024 4:35 pm

Leewebb7 wrote:Glen..you said the four postion is low high dim and bright...maybe what I'm thinking is "off" is actually low?? Nothing is labeled...

Yes, that is right. The 4 position switch has no off position.

Your Cub has electrical parts that were used before serial number 115403, I don't know why, unless someone has replaced the parts, or the Cub is older than 115403. Someone could have replaced the steering gear housing, because it froze from not enough antifreeze. The housing has the serial number plate on it. The housing and plate could be from a newer Cub.

The info below will help you identify the Cub's year more. Please look so we can figure this out better.
Writing down the numbers when you find them is helpful.
There is an engine serial number, it is stamped on the left side of the engine.
Below is a page from the 1950 Cub owner's manual, showing where the engine serial number is, you may need to clean it to see it.
https://farmallcub.com/rudi_cub/www.cle ... e%2002.jpg

There are casting date codes on the larger castings on Cubs. They tell the date when the parts were made. They use a letter for the year.
Below is info from TM Tractor showing what the codes are.
http://www.tmtractor.com/id/id_004.htm

The info below shows where the codes are.
The code on the clutch housing is usually partly behind the clutch pedal.
The code on the last part on the page, the steering gear housing, usually can't be seen with the tractor assembled.
http://www.tmtractor.com/id/castdate_loc.htm

The pics of the rear of the switch aren't real clear on my computer, but it looks like someone might have soldered wires onto the top and bottom parts of the holder for the fuse.
You can probably see it, being there.

Jim Becker
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Location: MN

Re: Voltage regulator...

Postby Jim Becker » Thu Jan 18, 2024 4:49 pm

The low charge resistor can be seen in the second picture of your last post. It is clearly a 4-position switch. If a legible decal were present, the 4 positions would be labeled and mean:
L - Low charge and lights off.
H - High charge and lights off.
D - High charge and lights on Dim.
B - High charge and lights on Bright.

I too am inclined to suspect the serial number plate came along with a replacement bolster. Checking date codes should sort it all out.

CharlieK
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Zip Code: 40165
Location: bullitt county, kentucky

Re: Voltage regulator...

Postby CharlieK » Thu Jan 18, 2024 5:05 pm

pics aren't real clear on my computer either
get er done; life is good

tst
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Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Voltage regulator...

Postby tst » Thu Jan 18, 2024 5:14 pm

follow the flowchart posted it will pin point your issue as you have a cutout relay system

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Glen
10+ Years
10+ Years
Posts: 6251
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Voltage regulator...

Postby Glen » Thu Jan 18, 2024 5:55 pm

Below are listings at TM Tractor Parts showing the decals used on Cubs with the 4 position, and 3 position switches.
http://www.tmtractor.com/new/de/de37.htm

http://www.tmtractor.com/new/de/de38.htm

Below are pages from the 1950 Cub owner's manual.
Page 1 shows the older electrical system with the hood off.
Pages 2 and 3 tell how to use the 4 position switch.
https://farmallcub.com/rudi_cub/www.cle ... e%2033.jpg

https://farmallcub.com/rudi_cub/www.cle ... e%2034.jpg

https://farmallcub.com/rudi_cub/www.cle ... e%2035.jpg

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Leewebb7
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Posts: 151
Joined: Mon Nov 27, 2023 6:13 pm
Zip Code: 27299

Re: Voltage regulator...

Postby Leewebb7 » Thu Jan 18, 2024 6:33 pm

Tst.....I'm not having any issues....I'm trying to figure out what all I have....I haven't even attempted to start it..I'm just going through and replacing what is either missing or has an obvious problem...it's even missing a battery and battery cables....lol..all the wiring looks like it needs to be replaced....I may do that too...it just looks like someone was in a hurry... it would probably work just looks rough

Eugene
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Re: Voltage regulator...

Postby Eugene » Thu Jan 18, 2024 6:59 pm

Since you have the generator apart, replace the bushings or bearing.

Suggest a single wire 12 volt alternator. Cost somewhere around $100- plus battery.
I have an excuse. CRS.

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Leewebb7
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Zip Code: 27299

Re: Voltage regulator...

Postby Leewebb7 » Fri Jan 19, 2024 9:05 am

Is there a way to test the cut out relay off the tractor??...I have the generator off and painted it was looking rough on the outside....also can you use a voltage regulator I the place of a cut out??....

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Leewebb7
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Re: Voltage regulator...

Postby Leewebb7 » Fri Jan 19, 2024 4:13 pm

It seems most cubs with the cut out, have a magneto....mine does not...it has a distributor...is this correct??

tst
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Posts: 5327
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Voltage regulator...

Postby tst » Fri Jan 19, 2024 5:19 pm

many mags were replaced by a distributor


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