Does the wire run to a realy from there? And what one of the four is for the fan that cools the motor? The parts stores show no listing of or for the relay, but say the wiring should go from the fan then to a relay.

http://autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1e/05/c0/0900823d801e05c0.jsp&eraseCrumbs=YES

Try getting a repair manual like Chilton or Haynes from a parts store that has wiring diagrams. Relay may be a dealer item only.

l am almost certain you will find what you need here

http://autozone.com/az/cds/en_us/0900823d/80/04/ad/42/0900823d8004ad42/repairInfoPages.htm -
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just click here

Probably because the $1300 computer that controls the fan relay is bad. Rewire it yourself with a fog light relay and switch.