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Thread: Opinions on ground wire location....

  1. #1
    Variable Bitrate bambam's Avatar
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    Opinions on ground wire location....

    A buddy of mine has his car wired so the speaker wires run alongside the passenger side of the car and all power wires run along the drivers side. He now wants to run a negative ground wire (I think it is 4 gauge) from the battery to the rear of the car but is not sure what side of the car he should run it.

    I'd like to hear the opinions of others. Would you run the ground wire on the drivers side with the power wires, the passenger side with the speaker wires or doesn't it make any difference?

    Thanks in advance to all who respond.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Since the ground is a power cable, I'd run the ground on teh side with all the other power cables.
    Although the ground could (should?) be connected to a heavy-duty chassis bolt, on an area that has been groung clean of any paint, dirt, debris, etc. That would save running a ground the entire length of the car.

    And the ground wire running with audio signal cables could make a difference.
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  3. #3
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    I believe you should run the negative wire, along with the positive wire. But why do you need to do that? You can find a nice place(maybe in the boot) that is predrilled, sand it down using some 200 sandpaper, clean it with acetone, and use it as your ground. Someone may confirm that you can apply some grease also to avoid oxidation. Then, you can use a distribution block, to "share" your ground to all your devices. Care must be taken, that all interconnected devices, share the same ground (possibly through the distribution block) as to avoid picking up noise. No fuse is needed there of course, since even in the case something bad happens and a negative wire is shorted, the voltage drop is negligibly low to provide harmful amount of current!!!

    Sorry for my English, might have done some mistakes above!

  4. #4
    Car Audio Moderator durwood's Avatar
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    Quote Originally Posted by qpwoeiruty999 View Post
    I believe you should run the negative wire, along with the positive wire. But why do you need to do that? You can find a nice place(maybe in the boot) that is predrilled, sand it down using some 200 sandpaper, clean it with acetone, and use it as your ground. [HL]Someone may confirm that you can apply some grease also to avoid oxidation.[/HL] Then, you can use a distribution block, to "share" your ground to all your devices. Care must be taken, that all interconnected devices, share the same ground (possibly through the distribution block) as to avoid picking up noise. No fuse is needed there of course, since even in the case something bad happens and a negative wire is shorted, the voltage drop is negligibly low to provide harmful amount of current!!!

    Sorry for my English, might have done some mistakes above!
    I wouldn't do that, it will cause a poor ground connection if applied before screwing or bolting down. You could get some of that stuff they spray on battery terminals if you are worried about rust after you have connected it.

    Either one of the recommendations above has my vote.

  5. #5
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    There is absolutely no need to run a cable back for ground. A car automatically provides grounding anywhere on the chassis. Just find a piece of bare exposed metal and connect to that for ground.

  6. #6
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    Quote Originally Posted by kostyanj View Post
    There is absolutely no need to run a cable back for ground. A car automatically provides grounding anywhere on the chassis. Just find a piece of bare exposed metal and connect to that for ground.
    And this is the #1 way a ground loop is introduced. I'd run the wire back if that's where everything else is connected since the copper wire would have less resistance than a steel car chassis.
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  7. #7
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    Without going into too much detail:
    A longer ground = more resistance in ground = greater potential for ground differential (ground loop noise)

    The chasis is the best place to ground everything. And going to the battery for ground is actually more harmfull than helpful as some may think. The best way to gain efficiency in your grounding wire is to do the BIG 3 UPGRADE. Also in some instances, the BIG 3 UPGRADE is not an option, its a must.
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    Longer wire = bad

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    Always make a groundwire as short as possible. Was once told to never make it longer than 3 feet. The ones I use for my amps are about 1 foot.
    And btw, always use same size or larger wire for ground, as for power. :-)
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  10. #10
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    What does "cross sectional area" Mean? I would assume that means what wires it runs along with. IF thats the case I have my ground which is about 12 inches long and it comes out with the power and lead wires is that bad?

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