I'm trying to hardwire my Beltronics GX65 to my Z4 M Coupe, and I'm not sure which fuse to tap into in the fuse box. I'm using an Add-A-Circuit to split one fuse into two. Which fuse would be the best to use?

I currently have the GX65 installed on the windshield to the top right of my rear view mirror, and I have the direct wire cord tucked in under the headliner, down the inside of the right A pillar, and into the fuse box. I currently have it sharing fuse 28. Everything seems to work and it looks really clean. Just wanted to ask if there was a better fuse to use.

I scanned a copy of my fuse box diagram, and used a test light to figure out which fuses are hot and when. Looking only at 5 amp fuses, I made the following color coded illustration:

Red - Hot all the time
Green - Hot at ignition position 1
Blue - Hot at ignition position 2

Fuses 2, 3, and 19 are unoccupied in my fuse box. 19 is listed as 20A, but 2 and 3 don't have an amp value. Does anyone know the amp value for fuse 2?

Also, does anyone know where to lookup the symbol to name mappings for the fuse box diagram? That would be the most helpful.