Ford Fiesta 2010-Fuse 17 keeps blowing

[qwerty1]

I have a 2010 Ford Fiesta. Fuse 17 (Ignition Switch), keeps blowing every other week or so. This has happened 3 times and I would change the fuse. I have taken the car to 3 garages and the fault isn't showing on the diagnostics, as I have changed the fuse. 

How do I go about this? I've been told that once the fuse blows again, not to change the fuse, but to tow the care to the garage. This isn't practical for me. How can I make the fuse blow again, near by so that I can take the car in?

I really don't want to get rid of the car, but I have no idea what to do.

[stef123]

I can’t see why a diagnostic scan would through up anything useful, it needs a proper diagnostic not just plugged in! It seems many garages are not capable or not interested in anything other than plugging in a scan tool sadly. 

finding an intermittent fuse blowing fault can be a nightmare!