Hello! Need some help on an install.

I've installed a portable XM player on my wife's 07 Fit....used the Add-A-Circuit for the cig./pwr. so the stock cig. isn't being tied up.

Only problem I'm having is finding a good fuse slot? I first tried an empty slot but the power to the XM stayed on constantly...I currently have it piggybacked onto the fuse for the rear window wiper but the XM won't turn on unless you have the key in the II position or have it started.

Fuse can only run on 10amps....anyone know which slot to tie into would be greatly appreciated!