Where to run 4 gauge wire to the battery throught the firewall in a 2005 mazda 6? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 8 (permalink) Old 10-04-2015, 01:13 AM Thread Starter
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Where to run 4 gauge wire to the battery throught the firewall in a 2005 mazda 6?

im trying to install an amp in my mazda however i am having trouble getting the power cable throught the firewall. as i cant get it throught the main wiring loom without pulling out the whole dash because the blower unit is covering it (right hand drive).i just wanted to know if there is another location i can runt he wire through?
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post #2 of 8 (permalink) Old 12-09-2015, 10:40 AM
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You can run it through the gromount under the drivers side. Theres wire already going through there. I fit 0 gauge
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post #3 of 8 (permalink) Old 12-16-2015, 12:25 PM
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Yup, Same here, running 0 gauge through the factory grommet on the left had side.


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post #4 of 8 (permalink) Old 12-21-2015, 03:15 AM
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There's also one more towards the center of the firewall, depending on where you want to mount stuff.
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post #5 of 8 (permalink) Old 02-13-2016, 05:07 PM
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The grommet under the driver side worked best for me, I've owned two mazda 6's and both i wired theough that grommet and through the fender


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post #6 of 8 (permalink) Old 03-14-2016, 04:55 PM
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Where did you guys ground the wire? I need help with that
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post #7 of 8 (permalink) Old 03-15-2016, 10:55 AM
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The toughest part about the grommet that the main loom goes through is (at least on the 3.0) is getting it up through to the battery. I recommend an extra set of eyes to help you find it coming through the firewall, but if you want to screw around with trying to get it to pop through, more power to you. With persistence, and some lube, you'll get it.

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Originally Posted by ekah View Post
Where did you guys ground the wire? I need help with that
That depends on where you're putting the amp. If you're putting it in the trunk, lift up the liner and ground it to the floor. There isn't anything under it, the closer you get to the spare tire well. Be careful if you're going to try to put it under the rear seats, you'll be close to the gas tank there.

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Geek Squad AutoTech

Last edited by ctg162; 03-15-2016 at 11:00 AM.
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post #8 of 8 (permalink) Old 05-08-2016, 11:00 PM
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Drivers side tech flexed stinger 0 gauge
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