"I tested them, some 90 Ohms, some not even making a connection. only 1 plug is doing 1 ohm. "
I'm gonna stick my neck out here and say that I've probably dealt with a exponential factor more glow plugs than you and have NEVER seen one Ohm out at 90 Ohms.
Almost without exception there are either "open" or "good".
A GREAT way to check them is with an Ammeter that can be connected in series with each individual GP or a clamp-on Ammeter that will read DC Amps.
When powered, prechamber GP's typically draw between 8 and 20 Amps.
When checked in that manner, the good ones will read similar Amps for a given system, and the open ones will read ZERO Amps.
As far as removing them, sticking in the threads is typically not an issue, it's the ones that expand/blow open at the tip as they fail and would rather break off in the prechamber that you have to worry about.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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