Routing an amp power cable
I'm installing a Rockford Fosgate amp in my 1997 GT, and decided to follow their recommendations and use their wiring kit. It includes a heavy gauge power cable with inline fuse, which connects directly to the battery at the positive terminal. I've fastened the fuse holder to the top of the underhood fuse box, and now need to figure out how to get the cable into the dashboard. Obviously I need to drill a hole through the firewall big enough for the cable and grommet, but I don't know where best to do so. I'd like to avoid drilling through multiple layers of metal. I've tried to find where various cable bundles enter the passenger compartment, but they're all well-hidden. I've thought about drilling near the steering shaft, as at least that's a recognizable landmark, but again I don't know how many layers I'd be drilling through.
Any advice would be very appreciated.