Posted by jdemaris on September 24, 2013 at 15:58:32 from (70.192.43.251):
In Reply to: Re: john deere key sw posted by Big P on September 24, 2013 at 15:21:48:
The way you wire it depends on several things.
Is the 12SI using a self-excite regulator or a standard "three-wire" regulator?
Do you want to keep your "idiot" charge light?
Do you still have breaker-points in the distributor or has it been changed to Hall-Effect electronic like Petronix?
Do you have the original Deere key switch with the built-in ballast resistor or does it have a Deere upgrade with a separate ballast resistor mounted elsewhere?
IF you have a standard regulator in the 12SI - and you still have points - and you want the idiot light - this is how I'd two it.
The OEM key switch IF it has a resistor built into - won't work well for powering the 12SI field. If you have the Deere upgraded switch - the "I" terminal can be used. If you do that -you MUST put a diode in-line to stop the alternator from back-feeding and preventing you from shutting the engine off. Better yet -get rid of the Deere switch and buy a universal battery-ignition switch that has B, S, ACC, and IGN terminals. Hook the IGN to the wire that goes to your coil (or ballast resistor). I'd swap two primary wires around on the coil since you are using negative ground now. Use the ACC terminal to power the field in the alternator. This way, no diode is needed. The charge light gets wired in this line (ACC to 12SI fields which is #1 terminal).
The "L" terminal on your original key switch is what sends power to the headlight switch. So if you have headlights - you need to keep power to that wire, one way or the other.
The "B" terminal on the original key switch went to the "L" terminal on the old mechanical voltage regulator. Now that the regulator is gone - this needs to be wired directly to the battery positive and ought to be fused.
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 ]
Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
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.