Adding stebel nautilus compact horn

[lmckean]

Hi All,

I'm going to add a Stebel nautilus compact which has a amperage draw of 18 amps. Now I'm assuming the stock horn fuse is less than that (15amps?). What would you say is the best way to hook this up. I do want to remove the stock one and put this one in it's place. Is hooking the positive directly to the battery using a 20-30 amp fuse then connecting the existing horn connections to a relay? Any insight would be appreciated.

Tired of the toy horn

Thanks