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You will need to drill a hole large enough for the cable being very careful not to damage anything on the other side of the firewall. You will need to purchase a rubber grommet to insert into the hole and then run the cable through to protect the cable. You only need to run one cable, as you can ground the negative cable near the battery.

Why are you running a battery cable through the firewall in the first place?

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Q: How do you run battery cables through he firewall of a 2002 impala?
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