So recently a purchased a 2010 wrx base. Sweet car but the sound system was horrible, and being a modding car, decided to start with the audio first.

I purchased a nissan wire harness avic x910bt head unit and installed it. Being my first installation ever, took an entire day. I'll post pictures if anyone wants to see what it looks like as soon as the installation kit comes in because currently there are some gaps as the oem head unit is larger then this one.

My problem and question now is. My hd tuner just arrived. GEX-P20hd for the pioneer. I know where it attaches to the head unit but it has a power cable that says Fuse (2 A) yellow connect to the constant 12 V supply terminal.

Where in the subby do i find that?