I have a 06 Honda CR-V and I'm trying to run the power wire from the battery terminal all the way back to the trunk. The problem is I can't find an opening in the firewall so I can get it inside the car. The wire is a 4 gauge wire. Any ideas how I can do this without drilling? I've asked local stereo shops but they keep telling me they'll do it for me and charge me, they won't actually tell me how.
The simple fact is that sometimes you just have to drill.
The reason they won't tell you is that there's no simple method that works the same on every vehicle. Sometimes you can share the same access point that the factory wiring uses, and sometimes you can't. I've installed amps into lots of different kinds of vehicles, but I don't have wiring methods memorized for each one. Generally I just have to take a good look and decide when I see it. But if you're unwilling to drill, you may have to let someone else do the job for you.
Usually (not always) the factory wiring runs through a rubber grommet underneath the driver's side dash. If so, you can often poke a hole in the grommet and run your new wire through there. However, it's easy to damage stock wiring if you're not careful or don't have the right tools.
Also, vehicles with automatic transmissions often have a "clutch plate" on the firewall, in the area where the clutch mechanism would be if the vehicle had a standard transmission. This is often a convenient spot to drill.
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