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The electrical system does provide the power to the glow plugs but it is not a constant current type system. Each individual glow plug acts as a resistance load on the batteries and draws current based on it's internal resistance. The good plugs are low resistance loads and will draw the most...

It sounds like the way you tried to remove the glow plug was incorrect if you snapped it off at the threads. If you held the center section with a wrench and then tried to unscrew the outer section it would have snapped the glow plug rather than unthreading it from the block and also have...