18-08-15, 06:52 PM
The wiring of the horn is the same on your 98-99 like on my 2003 Fazer and my 1999 TDM. Brown is +12V via ignition switch and pink is ground via horn button. On my Fazer the horn has a 10 A fuse that should be quiet similar on the early models. This is more than enough for the nav.
Guenter