You will need to remove the battery cover. Be warned. The top bolt can be a PITA. There are reports of the holding nut spinning and it will not come loose. If this is the case we will need to consult with some of the 500 guys on the best fix.
Once the lid is off you will see the fuse box cover.
The one you are looking for is the 15A ACC fuse.
There are spares on the side.