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Hi Bill,
A resistor is a pretty wasteful way of dropping voltage, you might be better off trying to get hold of a step-down DC-DC converter (possibly available from electronics shops; I don't know much about car electrics so I don't really know where to get one with the necessary power rating). This will be a lot more efficient; you'll be able to set up 6V to supply everything that needs it rather than messing around making a potential divider.
Sorry I can't be more specific about where to get such a thing!
Brad
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