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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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