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Thread: Getting a Wire from Battery to Amp

  1. #21
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    I'll agree with Cris on this as well...

    there is no need for a second battery. That amp that you have is more than likely only pushing 400watts, not 800.

    Even at 800 watts, I don't see a need for a second battery.

    And again, your warranty is void on your electrical system already - a hole in the firewall won't do crap....in fact it would be safer to run it through the firewall and grommet that hole than it would be to run it under the car or through some other ghetto way....especially if it's 8-4 gauge wire...
    Jan Bennett
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  2. #22
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    Here are some pics for ref My car in case anyone wants to see it (dunno why they would) next is the engine (which needs cleaning i know!) but as u can see its jam packed so as long a drill holes wont void the warrenty then ill guess thats what ill de doing at the weekend

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  3. #23
    See me in my wet t-shirt. stevieg's Avatar
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    Quote Originally Posted by madmunky
    Here are some pics for ref My car in case anyone wants to see it (dunno why they would) next is the engine (which needs cleaning i know!) but as u can see its jam packed so as long a drill holes wont void the warrenty then ill guess thats what ill de doing at the weekend

    My Car


    The Jam Packed Engine
    What you could do if you're not certain is phone up your local dealer and ask if they have an approved Car audio installer/electrician and then phone him up and get him to run the wire for you.

    You might find the firewall has two metal layers and it could be a lot of trouble.

    Another idea is there may be a grommot beside where the wiring goes into the passenger door. You may be able to run wire from the battery through the inner wing (you'd remove the plastic inner wing things) through to by the door. That's how I (and most others) do it on the Ford Focus.
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  4. #24
    FLAC sdashiki's Avatar
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    Best place on any car is the steering column rubber surround, poke some scissors from the drivers side thru the engine side and BAM, may take some shoehorning to get it thru the hole under the hood, but its sell sealing (tight rubber) and easy to find/puncture. Done in 4 of the cars ive worked on.
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  5. #25
    Tainted Love Cris's Avatar
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    Best thing to do is what Stevie said. Go to an aprroved installer and install the thing. Making holes in the firewall is pretty dangerous as there are plenty of wires there you could touch during the process.

  6. #26
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    if you watch what you are doing it's no more dangerous than having an installer do it, BUT you MUST watch what you are doing...
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  7. #27
    See me in my wet t-shirt. stevieg's Avatar
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    Quote Originally Posted by Red GTi VR6
    if you watch what you are doing it's no more dangerous than having an installer do it, BUT you MUST watch what you are doing...
    I suggested one that the Vauxhall garage he got the car from 'approve' - that way no warranty problems, and secondly you'd expect them to have worked on that model of car before.

    But as you say if you do your research and watch what you are doing it's no more dangerous to do it yourself.
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  8. #28
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    Like most people have said either go through the firewall by the steering wheel gromet, or you could remove the kick panel and go through the rubber that goes to the door. But dont go into the door with it. Instead poke a hole in that rubber and run it through the gap between the fender and the body right to the battery. Not the best way though. And like others have said wirring an amp to anything but the battery is a bad idea. ID also look into a Stinger or Optima battery instead of getting a second battery. WIth 4 subs you may also want to think of using a capacitor or two to help save the life of your alternator. Even getting a bigger alternator would with a higher amp load would be better than another battery.

    I am putting an extra battery in but i will be running about 6000 watts of car audio components in my truck.

  9. #29
    Newbie iKenndac's Avatar
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    Ok, the engine bay looks like my Vauxhall Astra. There is a *huge* grommet in the passenger side... the hole in the bulkhead (sorry, firewall) is huge. To find it, either follow the red + lead from the battery. It's a fair way down, and a pain in the arse to get to from the engine bay.

    To get to it from the inside, look right up the passenger-side footwell with a torch - you'll be able to see a big bundle of cables coming in. Make a hole in the big grommet, and presto! Amp wire.
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  10. #30
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    there is a grommet just follow the bonnet release cable

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