TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

Ford 9N, 2N & 8N Discussion Forum

Order Ford 8N Parts Online

8n 12V wiring with 7127 Alternator

Welcome Guest, Log in or Register

Author

Prentice

04-25-2008 19:47:40

Report to Moderator

Everyone,

I have searched and searched and I really hate to ask but I will for what I am sure the thousandth time..... I just cannot keep a battery charged on my tractor. I have a 7127 GM alternator with the P1 and P2 connectors. How in the heck do I wire the thing...no matter what I do, I cannot keep a charge. One wire, three wire, internal regulator, external regulator, exciter, diodes, idiot lights.....HELP!!! I do have the existing pully that came with the alternator (pretty small) so maybe that is the problem.

I am using an universal ignition switch w/ ACC terminal if that makes any difference...12V coil, amp meter on dash

[Log in to Reply] [No Email]

soundguy

04-25-2008 22:00:42

Report to Moderator

Re: 8n 12V wiring with 7127 Alternator in reply to Prentice, 04-25-2008 19:47:40

#2 to charge stud, #1 to coil side of ignition thru a marker lamp, or a diode, if using a diode, place marked end of diode toward alternator.. a radio shack 1n5408 diode or any 1a.50piv diode will work.. though a 3a/200piv will be better.

soundguy

[Log in to Reply] [No Email]

Hobo,NC

04-25-2008 20:08:27

Report to Moderator

Re: 8n 12V wiring with 7127 Alternator in reply to Prentice, 04-25-2008 19:47:40

One problem you have "wrong pulley" is were i would start,,, alts do like to spin and keep up with the engine RPM fer they will werk,,, alts when put'n out do load the belt rite hard,,, if you can take a finger and push the fan on the alt (engine off of course) the belt is 2 loose,,, either way the wrong pulley will come back to haunt ya

[Log in to Reply] [No Email]

Prentice

04-25-2008 21:48:21

Report to Moderator

Re: 8n 12V wiring with 7127 Alternator in reply to Hobo,NC, 04-25-2008 20:08:27

Hobo,

I will start with the pulley...5/8" 3" OD? Correct (I believe that's what I saw someplace)? Let me know please. There is an alt/starter shop near the house.

I feel better already!!

[Log in to Reply] [No Email]

Prentice

04-25-2008 21:57:17

Report to Moderator

Re: 8n 12V wiring with 7127 Alternator in reply to Prentice, 04-25-2008 21:48:21

oops....looks like 5/8" and a tad under 2.5" OD..... ..

[Log in to Reply] [No Email]

Hobo,NC

04-26-2008 04:45:54

Report to Moderator

Re: 8n 12V wiring with 7127 Alternator in reply to Prentice, 04-25-2008 21:57:17

Yep the smaller one would B better 98NAA5825

[Log in to Reply] [No Email]

JMOR

04-25-2008 22:01:39

Report to Moderator

Re: 8n 12V wiring with 7127 Alternator in reply to Prentice, 04-25-2008 21:57:17

2.5 will spin it a little faster than 3.0
5/8 was the more significant part.

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home | Forums

Copyright © 1997-2023 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy