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cut out on Farmall B

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farmer ted

03-20-2005 18:53:32

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I was wondering if anybody could explain to me what the "cut out" on the generator does? It is a set of contacts that open and close when the tractor is running and shut off. The reason is because the tractor never stops charging 17 amps. Is that contact supposed to open and stop current flow? Does it just make and break connection from the battery when the tractor is not running? What does lower the amps on a B when the battery catches up?

Thanks for any help.

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farmer ted

03-21-2005 19:57:59

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thanks in reply to farmer ted, 03-20-2005 18:53:32

Thanks for the info on the B. Helped me out quite a bit.

Thanks again.

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gene b

03-21-2005 03:57:16

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Re: cut out on Farmall B in reply to farmer ted, 03-20-2005 18:53:32

If you have the third adjustable brush on your gen you can set it so it will charge a lower amount. If you are running a magneto your system only needs an amp or so as thereis no current drain when tractor is running. I have 6 tractors with cutouts and mags and they just work fine also some with regulators and also dists. When replacing a cutout with a regulator make sure the reg is a match for your gen. If you look at the parts info you will see there are different ones listed.

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Bob M

03-20-2005 19:29:46

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Re: cut out on Farmall B in reply to farmer ted, 03-20-2005 18:53:32

A cutout is a simply voltage sensing relay. It connects the generator to the electrical system anytime the generator output voltage exceeds the relay "pull in" setting - about 7.0 volts for a 6 volt system.

The relay opens (cuts out) the generator circuit the anytime generator voltage drops below about 6.6 volts - to prevent the battery from discharging thru the generator.

A cutout does not provide any regulation of generator output current, ie as the battery charges up. This is the purpose of the L and H settings on the light switch. Set at H the generator charges at full current (about 15 amps for a Farmall); at L it limits charging current to 3 or 4 amps. Obviously then it's up to the operator to determine the battery charging rate. You can easily replace the cutout with a voltage regulator if you want automatic charging current control!

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