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Message: <blockquote data-quote="Speculant" data-source="post: 7155731" data-attributes="member: 629272">I'm installing 2 150watt amps in my friend's car, I already installed the aftermarket stereo and the signal wire and rca wires for the amps.  However, I need help with the +12v wire.  I've read around, and it looks like I can't just piggyback on the +12v for the stereo or the cigarette lighter, so I have to run my 8ga wire from the battery directly, which I am fine with.  However, I can't seem to find a hole in the firewall that already isn't being used by anything.  Can I just make a hole in one of the sheathes that is currently going through the firewall and kind of "slide" the +12v cable in?Also, do I need to ground the battery to the car frame?  Because it already looks like it is...</blockquote>

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