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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-03-2014, 04:59 AM   #1
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Join Date: Sep 2014
Location: Derby
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My Ride: E46 320d M sport
Subwoofer & Amp

Hi guys, do you know how I can get the power cable for an amp through the firewall from the engine bay into the cabin?

I have an 03 (facelift) e46 saloon is there any grommets that I can go through?

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Old 10-03-2014, 07:39 AM   #2
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Join Date: Jul 2008
Location: USA
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My Ride: 2001 330Ci
Why not use the battery that's in the trunk? You can tie your positive (+) wire to the battery, and the ground/earth to the body.

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Old 10-03-2014, 12:37 PM   #3
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Great I didn't realise it was in the boot

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Old 10-04-2014, 02:36 AM   #4
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My Ride: ESS TS2 320ci
There is a huge rubber grommet that connects the boot with the cabin, if you follow the battery positive cable (from the boot obviously) you will find it. It is exactly behind the rear seatbelt line

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