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That would be the grid heater. It heats the intake air before it enters the intake manifold. Same purpose as glow plugs but much more trouble free. It does draw a large amount of current. That is why you can experience dimming lights and such when it is doing its thing.
And I have heard 2 different theories on driving after starting. One is to fire it up and just go, and the other is to let the grid heaters cycle a few times before dropping into gear.