you should use a relay with the fog lights , there are wiring diagrams to do this on the web and onthis site , if you dont there is a potential of a fire .
you need a single pole single throw relay , bosch type . terminal 30 goes to the battery with a 30A fuse , terminal 87 goes to the lights . terminal 85 goes to ground , terminal 86 to turn the relay on and off , it to a switched power in the cab , this is the wire you put you fog light switch on . http://www.classictruckshop.com/club...h/foglites.htm