if clutch was replaced, and still no worky, check for power at connector, likely the tipm is shot, but a simple relay can power up your fan circuit.
here is a thread with the wiring diagram, (you might have to sign up to the forum to see the picture/attachments, its a free site)
fan clutch wiring - 04.5-07 HPCR 325/610 motors - ABDiesels.com
2003, QC/SB. Edge Juice,Hot, AirDog150/BMS50 nozzles S&B CAI, BD Flex plate/tripple loc T/C. georend VB/ Trans rebuilt by Me. Bilstien5100. carli coils, Air Bags. RETIRED Military Mechanic (20yrs)