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Where is the best place to run a power wire through the firewall of a 2002 civic? I saw a hole where a blue wire is already passing through on the drivers side, and a I saw a grommet on the passenger side behind the glove box that has a thick harness passing through it. Should I use one of these, or is there another grommet somewhere that doesnt already have wires passing through it?

 
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That grommet in the passenger's footwell is a very common place to shove the power wire through GO for it

 
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Depending on the size of the wire you may just want to drill your own hole low in the passenger firewall and pop a grommet in. Plus it looks much better.

 
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there is a blue tube going thru the firewall on the driverside.....pop out that gromet and pass ur wire thru there