car help

the car is a fiesta 14oocczetec s year 2000. 90 thou miles . own for 6 months as a 2 car for work.At the moment i dount have side lights bulbs checked plus wiring in the system including the feed to the fuse box. The column switch was changed this was faulty but all system was working.The column switch was 2nd hand from a local breakers. when the switch is turned for side lights /dash lights on the same system. the 7.5 fuse blows.THE wire diagram shows the battery ignition multifunction switch 7.5 fuse box the all of systems work on this left side -side light /all dash lights so is this part given problems in the past in the 14oocczetec range on the mk 5