I have a 1999 Maxum with a 4.3L Mercruiser. Haven't run it in about 3
weeks couple of weeks and tried to fire it up today. When I turn the
ignition switch to the "on" position, alarm sounds briefly, then my
gauges activate briefly, then everything shuts down...turns out I keep
blowing the 15A ignition fuse on the fuse block (went thru 2 of
them). Trim/tilt, blower, and everything else electrical is working
fine. Battery is good. I traced the wire from the ignition switch to
the fuse block and beyond, and can't find any visible cuts, frays,
etc.

The book shows 15A is the correct fuse. I'm wondering if:

A) 15A is a little light
B) The ignition switch is the culprit

Any suggestions?

Mike