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Cooked Generator?

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ol' poke

06-21-2004 10:58:43

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My 6-volt 8N's battery went dead a month ago - put a charger on overnight and she was good to go. Although she still starts easily, I was wondering of the generator was keeping up. The Ammeter always shows a few volts to the minus sign. Yesterday, I got out the volt meter to see what the readings were. First, I repolarized by shorting the regulator. At the battery - 6V with motor running or off - at the generator while running - Nothing! There are three contacts on the genny, two on the side and one on the back. I was just guessing which ones to take the reading from, but I got nothing from any conbination. Time for a new generator?, or better yet how easily serviceable are the part replacements? Should I check anything out else before dropping the $$$ on the genny/parts? If I should go the parts route, which parts should be replaced? Sorry for so may questions, and thanks in advance guys.

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Jim Cox

06-21-2004 14:20:58

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Re: Cooked Generator? in reply to ol' poke, 06-21-2004 10:58:43

Hey, Poke. with the Tractor running, try connecting a jumper from the F terminal to a good clean metal ground. If the voltage picks up, your VREG isn't working. If nothing changes, your genny is too tired. You can swap brushes in about twenty minutes or so, including removal from tractor and replacing afterwards. A top-notch New Holland Reman Genny is probably about $125 or so, and a brand new made-in-india/china piece of crap $80-90. If you're not near a dealer, don't forget the mom-pop shops. New armatures, field coils, and brushes are still available. Scroll down below for a nice wiring diagram posted earlier too.

Good Luck
Jim Cox
Stealth Generator Guy

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ol' poke

06-21-2004 14:00:59

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Re: Cooked Generator? in reply to ol' poke, 06-21-2004 10:58:43

Thanks Bruce & souNdguy. I am using an analog multimeter, and I get 6V at the battery whether the engine is running or not. I will check the readings at the generator as souNdguy recommends. If the end result is a dead generator, how difficult is the replacement of the brushes, or any other parts that may need to be replaced. How can I tell? Is it worth getting a re-built one and where can I get one or parts? Again, lots of questions and thanks all in advance.

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souNdguy

06-21-2004 12:25:02

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Re: Cooked Generator? in reply to ol' poke, 06-21-2004 10:58:43

Here's a brief genny 101 for your 8n

On that 3 wire a-circuit genny.. there are 3 posts.. a large one on the rear plate is the armature.. this is where the charge 'comes out'.

Then on the barrel there are two posts.. one will be insulated from the case by a rubber gromet or phenolic washer.. this is the field. The other is ground, and is common to the case. With the engine running you should read about a volt or so higher on the battery and on the genny armature, when checked to ground. If you are reading no volts onthe armature to ground, jumper the field to ground and then check again.. this full fields the genny. If you get 7 volts on the armature.. but still just 6ish volts on the battery.. the regulator is bad...

I'm sure Jim Cox will be along to polish up that rough explanation.

Soundguy

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Bruce (VA)

06-21-2004 11:09:24

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Re: Cooked Generator? in reply to ol' poke, 06-21-2004 10:58:43

Are you using a digital or analog meter? The digital meters, especially the cheap ones, will not read well, or not at all from these old generators. Output should be 6.5 to 7.5v. If you get nothing anywhere, and it is not your meter, then the brushes in the generator probably need replacing at a minimum. Worst case is a total rebuild; that cost my neighbor $70 here in VA last week for her 2N generator.

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