Generator

gblj · Nov 4, 2008

I have a 8n 6v system

A friend check"s out my electrical system and says I need a voltage regulator,so I put one on (yes I polorized it) the tractor runs good for a couple of days, today it dies like its out of gas, I check gas, gas is good starter wont start, not even a click click, take the battery out of the farmall cub put it in the 8n it starts right up, take -negitave cable off battery it shuts off cousin says I need generator, before I spend the money I want to know for sure. What do you guys think?

Mike Groom · Nov 4, 2008

Take your gen.in and have it checked,was your amp meter showing a charge?Mine did the same thing as yours and it was a bad voltage regulator,the battery got so low that the tractor wouldn't stay running,It shut off just like I turned the switch off.

gblj · Nov 4, 2008

When my friend checked it the first time I put on a new voltage reg, It showed it was charging at first then everytime after that it stayed on zero, I cant find anyone who can check the generator off the tractor.

Anonymous-0 · Nov 4, 2008

Do you have a voltmeter if not buy even a cheap $20.00 multimeter. Also remember since you are dealing with an 8N you have a B circuit generator not an A circuit like most everyone else. Test procedure is a little different. Get back with me tonight. I am on a business trip the rest of the week. Do you know what a generator motor test is> J.

Janicholson · Nov 4, 2008

With it running, run a jumper wire from the hot side of the battery to the F (little) terminal on the generator. It will spark just a little and should start charging on the amp gauge. If it does, the gen is probably good. If it does not, it still could be the VR cutout relay. The jumper should not be left on after testing, as it allows the voltage to be excessive. If it does not charge when the jumper is on, Check the voltage at the Arm terminal of the gen, it should be 7 to 8 volts.
If it is and it is still not charging, the regulator may be toast. JimN

gblj · Nov 4, 2008

Sorry, I dont know what a generator motor test is?

glennster · Nov 4, 2008

here is a link to john t's charging system test proceedure. print it out, then go to the tractor, start at step one and do each test as instructed. it should pin point the problem. if you still cant get it to charge, write down all the test results and holler for janicholson!!!! he got my h charging.
john ts charging test

John-MI · Nov 4, 2008

8N fords use 2 different Generators and Regulators. A & B Types. I always took the generator and regulator to the repair shop to make sure they were matched correctly. Hard to tell the difference if you dont know what your looking for.

Bob · Nov 4, 2008

"8N fords use 2 different Generators and Regulators. A & B Types."

NO, they don't. HOW do myths like this get started????????

The 9N/2N/9N series ALL used "A" circuit charging systems.

Later tractor series used a "B" circuit system, and those generators mounted differently, and won't easily fit a 9N/2N/8N.

Brian Jasper co. Ia · Nov 5, 2008

Generator motor test is pull the drive belt then jump from the battery term on the regulator to the arm term. The generator will spin like a motor. While spinning, ground the field terminal. The generator should slow down. If it does, your generator is probably ok. Little things like brush holders can stick making it not work all the time. With the engine running, ground the field terminal at the regulator. It should give maximum output. If it does, the generator is ok and you have a regulator issue.
I don't know about Bob, but the guys on the N board have talked about "A" and "B" circuit generators. I don't know for sure, but "A" or "B" may be the difference between a 3 brush and a 2 brush?

Generator

gblj

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Mike Groom

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gblj

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Anonymous-0

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Janicholson

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gblj

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glennster

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John-MI

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Bob

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Brian Jasper co. Ia

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