Ford 8N Alternator wiring and gage wiring

Shane Mccauley · Aug 29, 2011

Just replaced the alternator on a Ford 8N Tractor thinking it was bad because i pulled the positive terminal off and the tractor died.ok i put on a new alternator and a new gauge on when i pull the positive terminal off the tractor dies just like before. Anyone have any ideas on the wiring for my alternator? It's not charging I have the standard plastic fuse like plug that has two wires going into it plugged in with one wire going to the alternator and the other i think it’s on the ignition switch. Yes i need to quit and go home but i am trying to help out my 84 old dad with this. Somewhere along the way he got it wired wrong.any help would be appreciated. Shane

old · Aug 29, 2011

NEVER test one that way good way to fry the alternator and if you do something wrong you can fry your self. When you unhook it then the VR sees a dead battery and goes to max volts and amps and that fried the VR and then it is putting out up words of around 90 volts at 35 plus amps and that is 35 million times more amp then it takes to kill a man.
That said check the archives in the N forum and Bob has posted a diagram/picture many times. It is really easy to wire up.

Shane Mccauley · Aug 29, 2011

Thank you thank you thank you

old · Aug 29, 2011

I could explain how to wire one up but do not have the diagram to do so that is why I said something about Bob showing a picture of where each wire goes. Some people believe that I am crazy when I say it is not safe but I have seen first hand what the voltage is on one like that

Shane Mccauley · Aug 29, 2011

Hey i believe you thanks. you said something about Bob showing a picture of where each wire goes do you know where i would go to look that up.

JMOR · Aug 29, 2011

(quoted from post at 18:31:42 08/29/11) Hey i believe you thanks. you said something about Bob showing a picture of where each wire goes do you know where i would go to look that up.

http://ytforums.ytmag.com/viewtopic.php?p=4575787#4575787

old · Aug 29, 2011

He has posted that many times in the Ford (9/2/8N ) forum which is down lower on the main page. That said you have the plug with 2 wires. The #2 on that plug goes to thew big post of the alternator. The wire from the #1 goes to the hot side when on of the ignition switch and the wire from the big post 10 gauge goes to the battery side of the solenoid so now you have it explained sort of but you also need a diode or light bulb in the #1 wire or you can not shut the engine off

Will- Tx.-Mn. · Aug 30, 2011

are you talking a 12 volt alternator?

Shane Mccauley · Aug 30, 2011

old · Aug 30, 2011

Yes and yes it can in fact put out more then 90 volts at over 35 amps. O have seen the test done and know first hand that it can/will do so and that is by far more then enough to kill if you did happen to get across the leads

Ford 8N Alternator wiring and gage wiring

Shane Mccauley

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