I don't think so. What wire are you talking about? I am sure the wire going to the stock horn will not take anywhere near 45 amps. That wire is somthing like 18 AWG. This is really dangerous advice - someone will smoke their wiring harness!nonopr said:Yes you can, even if you swith to the 20a fuse the cables are rated to 45 amp. it is just the matter of how much amp those the fuse will hold.
Thanks