there should be a center tap wire that feeds that relay giving only 12V to the glow plugs, the resistor is most likely just a voltage dropper to let a 12V relay function to turn this on.
get some more 11V glow plugs, their resistance should be in the range of .75 ohm each with a reading in the range of .1-.2 ohm for all 4 in parallel.
What you want to do is grab a snarking great resistor (heater element wire works well) and wire it in series with the 11v glow plugs and the feed the lot 24v.
Smart people wire the resistor in in the inlet manifold.
you could also get 6v glow plugs and wire them in series in the same way as the series diesel uses 3v glow plugs
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