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Wiring power through firewall for stereo install

 
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Old 05-17-2008, 09:16 PM
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Wiring power through firewall for stereo install

So I'm doing some install work on my stereo setup. I had initially ran my power using an 8 gauge wire from my battery, under the area where the hood's hinges, down and into the car via the door. This way when you open the door you can clearly see a bright red wire and it looks ghetto in my opinion. I've almost always done installs this way. It's the quick and dirty way to do it and to be honest I've never had any problems with this method. I just would like my Prelude to look a little nicer than that. I've already started doing the wiring for my high/mids using some 14 gauge OFC and had a little trouble getting the wire past the wire harness and through the rubber seal, but it was doable.

I'm having a little issue running the 8 gauge from my battery through the car's firewall though. Under the fuses, on the passenger side, where the hood's hinges are, are two wire harnesses each with seals. The seals are taped at the end with electrical tape so I unbinded one of them to shove the 8 gauge through but it was too tight of a fit. I couldn't get it threaded through to where I could pull it from the inside of the car.

Has anyone had luck running their power from the battery through the firewall to their amps? If so which area did you run it through, was it one of the seals under the fuses?
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Old 05-17-2008, 09:26 PM
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Try cutting some of the rubber/foam gromet where the engine harness routs through that you were trying earlier. Use some RV gasket sealer to reseal it. Its a bitch to rout that way but In my opinion its easiest because you dont have to cut the firewall or anything.

Im glad your doing this becaue running a power wire through the door jam is a fire waiting to happen. If the wire insulation get rubed through and it contacts any metal that is grounded metal you have a powerful short to ground that will start a fire not to mention fry your ECM/PCM and probibly draw enough amperage that your batter could explode within a mature on minutes.
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Old 05-18-2008, 10:13 AM
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i actually drillled a hole through the plate where the clutch is supposed to be and then ran it under the carpet...still pretty ghetto but you cant see it in the car. i dont even have an amp hooked up i just was bored one day
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Old 05-18-2008, 12:32 PM
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Trying to find a hole in the firewall
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 05-18-2008, 03:40 PM
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Well I ran 4 gauge to my trunk to a block then reduces to 8 gauge.

Well I cut a small slit into the rubber gromlet to the main wiring (I'd take a pic of it but I'm at work right now) and pulled it thru into the passenger's side floorboard I suggest sealing that rubber gromlet up with either silicone or some sort of gasket sealer stuff. You'll have to take the carpet up and really have to fish around in there to find the end to pull it thru.

This way is almost as effortless as the way you did yours but you won't have to worry about the wire's shielding being cut or worn by bare metal and eventually shorting out.

I'll get some pics and post them tomorrow as I won't get home until like 7 pm and its a bit too dark for a photo under the hood by then.
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Old 05-19-2008, 12:14 AM
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I got it wired. I didn't cut through the rubber gromet though. Instead I devised a bit of a trick by using an oversized straw cut to 3" length and I pushed that into the opening of the gromet after removing the electrical tape. This allowed me to shove the wire through the straw without the friction of the rubber stopping me from pushing the wire through to the other side. Afterward I removed the straw piece and retapped the rubber gromet and wire harness with electrical tape. I think this is a quicker, easier and better way to do this.

This was a straw I got at the grocery store in the ice cream and frozen desserts isle. It's made for milkshakes and it's radius measures almost 1 1/4" (3/8" diameter).

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Old 05-19-2008, 04:05 AM
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That's a great idea with the straw, I might give that a go next time...
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Old 05-19-2008, 04:39 AM
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That's a great idea with the straw, I might give that a go next time...
Make sure to give me rep if it works for you, =p
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