1949 Cub Electrical rebuild

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Jude
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Zip Code: 20774

Re: 1949 Cub Electrical rebuild

Postby Jude » Mon Apr 15, 2024 11:50 am

Thanks, all cleaned up and hopefully ready to go. I plan to install this afternoon with a new wiring harness.
Do I need to polarize the generator, and if so, how?
It is a 3 brush with cutout relay.

Bob McCarty
Team Cub
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Re: 1949 Cub Electrical rebuild

Postby Bob McCarty » Mon Apr 15, 2024 11:55 am

To polarize the gen: viewtopic.php?f=140&t=56748
"We don't need to think more,
we need to think differently."
-Albert Einstein

Jude
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Zip Code: 20774

Re: 1949 Cub Electrical rebuild

Postby Jude » Mon Apr 15, 2024 7:47 pm

Thanks,
Another question: How do identify the terminals on the ammeter? I know one goes to the starter, and the other to the fuse and the cutout relay, but which is which?

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Glen
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
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Location: Wa.

Re: 1949 Cub Electrical rebuild

Postby Glen » Tue Apr 16, 2024 12:45 am

Hi,
Below is the wiring diagram for a 1949 Cub, with a magneto.
When the battery is connected, turn on the lights, the ammeter should show discharge. If it showing charge, change the wires on the ammeter to the opposite posts. It should show discharge then.
When the engine is running, check the generator output on the ammeter, it should show charge, when the engine is above slow idle speed.
The 1949 Cub owner's manual on here tells how to use the 4 position charge and light switch, on page 34.

The diagram below doesn't show the magneto or the wire for the magneto. The magneto uses an ignition switch with 1 post for a wire to connect to it. The wire goes to the small post on the side of the magneto.
The switch grounds the magneto to stop the engine.
Don't connect any battery power to the magneto if it using the original style coil in the top of it.
Below are pictures from TM Tractor Parts showing the original style ignition switch for a 1949 Cub.
http://www.tmtractor.com/tm-tractor/gel ... ng_001.htm

I have seen new ones for sale online in the past.
TM Tractor Parts sells the newer style switches also, if you need to buy a switch. :)
Attachments
cubwire.jpg

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Bill V in Md
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Tractors Owned: 1948 Farmall Cub
LT1045 Cub Cadet
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Re: 1949 Cub Electrical rebuild

Postby Bill V in Md » Tue Apr 16, 2024 7:12 am

Jude wrote:Thanks,
Another question: How do identify the terminals on the ammeter? I know one goes to the starter, and the other to the fuse and the cutout relay, but which is which?

Below is a photo of the actual ammeter wiring on a 48 Cub, 6v, magneto with generator and cutout relay. As you can see, there are two wires on the right terminal of the ammeter and one wire on the left ammeter terminal. Also, as you can see, the black wire on the right ammeter terminal goes to the fuse on the 4-position light switch. The other wire on the right ammeter terminal goes to the generator relay cutout (BAT Terminal). The wire on the left terminal of the ammeter goes to the starter switch. Hope this helps.
photo 6_resize.jpg
Bill VanHooser
Cub 54 Blade, Cub 193 Moldboard Plow, Cub 28A Disc Harrow
Circle of Safety

Jude
10+ Years
10+ Years
Posts: 19
Joined: Wed Feb 20, 2013 9:38 pm
Zip Code: 20774

Re: 1949 Cub Electrical rebuild

Postby Jude » Tue Apr 16, 2024 4:06 pm

Thanks!
Is there a way to test the ammeter before I complete the install?

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Bill V in Md
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Posts: 1143
Joined: Sun Feb 02, 2003 6:51 pm
Zip Code: 21228
Tractors Owned: 1948 Farmall Cub
LT1045 Cub Cadet
Circle of Safety: Y
Location: MD, Catonsville

Re: 1949 Cub Electrical rebuild

Postby Bill V in Md » Tue Apr 16, 2024 5:47 pm

I have not done this, but you should be able to use jumper wires to connect the ammeter in series between the 6v battery and the Cub’s 6v light bulb. When the bulb lights up, the amp gage should show the current draw. The bulbs are rated 24 watts, so current draw should be about 4 amps.
Bill VanHooser
Cub 54 Blade, Cub 193 Moldboard Plow, Cub 28A Disc Harrow
Circle of Safety


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