If your PU didn't come with factory installed fog lights then you will need to replace your headlight switch with a fog light enabled headlight switch.
Here is a link to the factory dealer-installed instructions.....
http://www.mopardodge.com/accessories/Instructions/82208102AC_IFU.pdf
You only need to get the components you don't already have. The headlight switch that is fog enabled will pull out for fog light operation, if yous doesn't you need to replace the switch and do some wiring as shown in the pdf file linked above.
Hope this helps!
Mike
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