You need a relay. A relay will draw a very small amount of power from your headlight circuit and use that as a "signal" to switch on power from another source (like straight off your battery) to actually power your fog lights.
Here's a good explanation of how relays work: http://www.the12volt.com/relays/relays.asp
fog light wiring
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Re: fog light wiring
Josh
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'72 F-100 Sport Custom 4x4
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'72 F-100 Sport Custom 4x4
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