2001 ford focus acting up with the running lights?

I have the 2001 ford focus last night it kept blowing the 10 amp running light fuse. Today when a mechanic tried reproducing the symptons it wouldnt blow for him. All lights are working no shorts were detected Any tips?2001 ford focus acting up with the running lights?try putting in a bigger fuse id say a 30 amp if it blows that try a 40 and if it blows that then you should take it to a garage again