"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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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