I have a 2003 Honda Accord. I'm trying to put an amp and sub in it. My problem is, I'm not sure how to get the power cable from the batter to the inside of the car. I know it needs to go through the firewall, but I need to know exactly where. I couldn't find any unoccupied holes. I also need to know where the other side of the hole will be so that I can grab the wire from the other side. Pictures would be really great if you have them.
The simplest way to run a wire through the firewall is to look for a rubber grommet where the steering column, brake pedal rod, clutch pedal,etc. go through. You can make a small slit here, or slide the wire along side this component.
The best place to run a wire through the firewall is through the firewall connector. Take the firewall connector apart, and look for an empty connection port. Take your power supply wire and hook it up to the engine compartment side, then take another wire (to lead to the radio), and hook it up top the corresponding port in the interior side of the connector. This will be the best way to make your connection. If you can't do this, then drill a hole in the firewall, install a grommet to protect the wires from the firewall. Again, the firewall connector will be your best bet, and people will be asking where did you take it to get it installed. This is how a professional would do it.
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