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.
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