Out of curiosity, how long do you glow? On a cold day our W50 needs a very slow 10 count. If I skimp, I'll get no firing and realize she needs more.
Random thoughts to consider...
If one glow was bad, I think you would still start with a stumble. I've run the thing on 3 cylinders before so 3 warm glo plugs would maybe start with a stumble and then smooth out as the fourth cyl comes to life. If that's true, perhaps that means your issue is common to all glow plugs i.e. wiring harness, glow button, or just the length of the glow.
Last suggestion, I find on cold days she needs a crank that is fully up to speed. A weak batt can start her in the heat but with cold she needs the fast crank to get the oil flowing and the compression up. If you hear a difference in crank speed between your first attempt with one batt and your second with all, perhaps your starting battery is losing it's umph just enough to be an issue only on a cold day.
_________________ SMMO/First Mate aboard High Flight #299 1981 - Full Keel - Furling Main (A boat for the lazy crew...)
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