Steve@Advance said: (quoted from post at 23:43:51 01/09/15) Yes, the small wires need to have power. The S terminal will be hot all the time. The F or L terminal (depending how it's wired) will be hot with the ignition on.
No, the small wires go directly to the PCM. The S terminal is not even used. The engine computer controls of the charging system on these trucks. The two little wires are "F" (gray) and "L" (brown). The PCM uses a duty cycle on the field circuit to control output. The "L" circuit is simply for charge indicator.
Sadly a lot of vehicles have moved to PCM controlled alternators some for a long time, it sure complicates matters when trying to decide if the PCM could be the problem or not. Diagnosis should include testing the PCM for codes and tracing wires from alt to pcm, but more than likely its the alternator that is the problem, as easy as it is to remove I would have them double check it. After that its time to test wiring.
This post was edited by 4play at 20:20:56 01/09/15.
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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
... [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.