Since that fuse is tied into a number of other circuits, it is possible that it has 
nothing to do with the horn at all.  I would check the schematic
for the particular year of your car to see what other things are being protected by 
that fuse.  

When You do, start by unplugging all the circuits except one and see if the fuse still 
blows.  If it does not, plug in another circuit and check the
results.  Continue until the fuse then blows.  Once you have determined which circuit 
is at fault, unplug all the other circuits except that one and
see if it continues to blow.  If it does, trace the wire from the fuse to the 
particular component.  It is likely shorting out somewhere along the
way.  If the wiring is good, the component itself might be bad or shorting internally.

Joe 

[EMAIL PROTECTED] wrote:
> 
> Hi guys,
> 
> Now the fuse that controls the horn etc is blowing after a short time. the
> horn works for a while but then the fuse just blows as im driving down the
> road. any ideas?

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