2001-2006 Ford F150 4.6L
Remove the engine cooling fan and the shroud. Rotate the tensioner pulley clockwise and remove belt.Inspect all of the pulleys and make sure non of them are damaged and are free of any debris.
Route the belt according to the above diagram. Leave the tensioner pulley for last and be sure to keep tension on the belt. Rotate the tensioner again and slip the belt on. Make sure your belt is on every pulley correctly before starting your vehicle.