Why do I keep blowing my relay ignition fuse Mazda B 2300 series pick up truck every time I turn the key in engage the clutch to start the truck blows the fuse

I had same problem. It turned out to be a raw wire inside cab hanging down behind clutch pedal making contact when I depress pedal. Fixed out and no problems since.

Turn key to ON but do NOT try to start.... Depress clutch .... Fuse blow now?.. That will determine if problem is in start circuit or clutch interlock!!.. What circuit is fuse labeled to protect? .. What is that fuse for? .. Method to the madness is key to this mystery!