Resistance test with an ohm-meter does not work all the time with all plugs. An amp-draw test is more reliable, it puts tests the plugs under real-world use. Hit each plug with full battery current for just a second or two. At 12.5 volts they should draw 7-8 amps each but will vary a bit on what brand plug it is. There is usually no inbetween - either it will draw current - or it won't.
Some IH tractors (B275, B414,424,354,444,2444, etc.) have all plugs hooked in series, i.e. when one goes bad none of the others will work. I don't belive that's the way your's is hooked.
504 or a 2504 ought to have a glow-plug meter hooked to a glow-plug switch - then wired to a terminal block near the engine. That feeds all the glow plugs in parallel.
OEM plug for your tractor is rated 11 volts, 95 watts, and 8.6 amps. Same plug is used in IH D188, D236, D282, and D301 engines.
Numbers for new plugs include 304131R3, 343894R1, 343977R1, 67464, AG40, AG40C, D88516 and D91934.
You can buy new ones on this website. Prices here are just about the best around.
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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
... [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.