Glow plugs are usually like light bulbs... they either work or they don't.
Are these pencil GP's connected in parallel?
If so, and you have access to an Ammeter (30 to 50 Amp rating), you can power up each one individually through the Ammeter and verify that each draws close to the same current.
Since the GP's likely aren't rated for continuous duty at full battery voltage, take the reading quickly and move on to the next, so as not to overheat the GP's.
(BTW, if you are doing that with them not installed, wear eye and face protection, as I have seen them pop open and throw shrapnel, if overheated.)
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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