1955 cub not charging

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oldiron29
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1955 cub not charging

Postby oldiron29 » Thu Jul 16, 2020 6:00 pm

Did some testing today It has 4 terminal VR and 3 brush generator. full ground field no charge.
jump gen to bat on VR and I get it to charge about 3 amps. At lest the needle moves
I read that 3 brush generator should have a cut out only?
Generator motor test ok I no it would be less expensive to get the cut out than to buy another 2 brush generator.
I have been trying to do things correct. What would you do?
RED IS GOOD! BUT GRAY IS GREAT!!
'49 cub/1000 loader '50 cub/193 & 54A
'50 cub demo/22 '57 cub/project
'36 F-12 '35 F-20 '39 F-14 '37 F-30
'52 C '40 B '44 BN '50 SA demo
'27 regular/steel '28 regular/rubber

Mahoman
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Zip Code: 06076
Tractors Owned: 1949 Farmall H “Hap”
1947 Farmall cub “unnamed”
1947 Farmall cub (my mom claims it’s hers and calls it “Petunia”)
1965 Allis Chalmers B10
Circle of Safety: Y

Re: 1955 cub not charging

Postby Mahoman » Thu Jul 16, 2020 6:35 pm

Did you polorize the generator? Don't know how to do it for a cub but my H you run a wire from the middle terminal on the volt reg to one of the terminals on the generator while it’s running and when you see a spark it’ll charge
1949 Farmall H “Hap”
1947 Farmall cub “unnamed”
1947 Farmall cub (my mom claims it’s hers and calls it “Petunia”)
1965 Allis Chalmers B10

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oldiron29
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Location: Miller Place, NY

Re: 1955 cub not charging

Postby oldiron29 » Thu Jul 16, 2020 6:58 pm

I had the bat wire off the VR and could not remember if I polarized it after that. just went out and jumped from Bat on VR to A on generator.
engine Running, multi meter on battery says 6.27-28 not running battery reads 6.30 If I take battery cable off engine dies. So I am going to say it is not charging, no mater what I see on amp gauge.
RED IS GOOD! BUT GRAY IS GREAT!!

'49 cub/1000 loader '50 cub/193 & 54A

'50 cub demo/22 '57 cub/project

'36 F-12 '35 F-20 '39 F-14 '37 F-30

'52 C '40 B '44 BN '50 SA demo

'27 regular/steel '28 regular/rubber

Mahoman
Cub Star
Cub Star
Posts: 54
Joined: Wed May 06, 2020 7:47 pm
Zip Code: 06076
Tractors Owned: 1949 Farmall H “Hap”
1947 Farmall cub “unnamed”
1947 Farmall cub (my mom claims it’s hers and calls it “Petunia”)
1965 Allis Chalmers B10
Circle of Safety: Y

Re: 1955 cub not charging

Postby Mahoman » Thu Jul 16, 2020 7:29 pm

How old is that battery, and how is your cable? I’d also check for loose wire and corrosion, if nothing else either rebuilt the gen or get a new one. Unfortunately I’m no expert on any sort of electrical issue but I’d say in my brief career in the mechanics world I’d say 9 time out of 10 it’s corrosion of course this is with newer trucks so it’s different with these old contraptions. I’d start tracing wires. Hell of a lot cheaper than doing a generator.
1949 Farmall H “Hap”
1947 Farmall cub “unnamed”
1947 Farmall cub (my mom claims it’s hers and calls it “Petunia”)
1965 Allis Chalmers B10

Jim Becker
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Re: 1955 cub not charging

Postby Jim Becker » Thu Jul 16, 2020 8:03 pm

Three things:

1) Polarize the generator after installing/connecting components BEFORE STARTING the engine.

2) NEVER disconnect the battery when the engine is running.

3) Early voltage regulator systems used a 3 brush generator. Cut-out systems had a 3 brush generator with an ADJUSTABLE third brush.

Waif
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53 F-Cub W/Loader.
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Re: 1955 cub not charging

Postby Waif » Thu Jul 16, 2020 10:38 pm

Members post trouble shooting charts.
I just copied the first thread that came up on a search.viewtopic.php?t=42177

You did not say what all you have.
6V pos. ground for example. Distributor ignition ,ect.

Your regulator is suspect. But run through the flow chart and see what you find if applicable to your Cub..As the entire system is suspect too till proven otherwise. Is your battery good enough to accept a generators charge? All connections proper gauge and connected clean and snug?

There's two point like contacts in your regulator (if I'm guessing the right one). And components affecting them. (Mine was cleaned up best I could but was still real corroded. I swapped it out.)
IF you replace the regulator , consider the quality of the unit you replace it with. Not all are equal.

tst
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Re: 1955 cub not charging

Postby tst » Fri Jul 17, 2020 8:03 am

by disconnecting the battery why its running is a good way to destroy the regulator

Jim Becker
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Re: 1955 cub not charging

Postby Jim Becker » Fri Jul 17, 2020 11:31 am

tst wrote:by disconnecting the battery why its running is a good way to destroy the regulator

Or worse yet, causing a spark that coiuld trigger a battery explosion.

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Glen
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Re: 1955 cub not charging

Postby Glen » Fri Jul 17, 2020 4:55 pm

Hi,
The 3 brush generator was used with the Cutout, or Relay, IH called it, and used with the voltage regulator system, until 1962, the Cub parts manual says.
Then IH changed to the 2 brush generator.
A 1955 Cub probably originally had a Delco generator, model number 1100501. You can look at the plate on the gen, if it is there, and see the number.

Below are pages from the 1955 Cub operator's manual, showing the wiring, and the 2nd page has a pic with the hood off.
The numbers on the 1st page are explained on the 2nd page. :)

http://farmallcub.com/rudi_cub/www.clea ... e%2049.jpg

http://farmallcub.com/rudi_cub/www.clea ... e%2050.jpg

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birddog
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Re: 1955 cub not charging

Postby birddog » Fri Jul 17, 2020 5:26 pm

I would say if it doesn't charge with the field grounded there is most likely one of two problems. The generator isn't charging or wiring. I suppose it could also be the regulator, but I've never seen it.
Mark "birddog" Birdeau
Circle of Safety


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