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If you cannot find a hole already there with a rubber plug then run the wire along with something else that is already running into the interior. If that is not possible then drill your own hole. Just make sure you are not drilling into something on the other side. Purchase a rubber grommet to fit the hole you will have to drill and run the wire through the grommet. Drill the hole so that the grommet fits tightly.

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Q: Where is the hole in the firewall on a 2003 GMC Sierra to run a power wire from the battery to the amplifier?
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