we need expert "lektrishann" to find a short in a mehran wiring?
btw - this problem is expected to be resolved by the user of the car as the circuits are on a fuse which are accesible with no tools and have markings on them too.
The user manual of every car shows you the fuse locations.
As a rule a higher amp rating fuse is never used as remedy. The fuse is there to act like a "fusible link" and not a bridge.
please have a look at this picture, it explains fuse ratings