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Thread: Earth connection in boot

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    Ex-Staff Full Member Ian T's Avatar
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    Default Earth connection in boot

    A question for electrical & audio experts

    I am going to be fitting a capacitor in the boot, is the earth point near the rear lights ok to use?
    Or should I fit it to a larger bolt?

    It is a 1 farad capacitor, using 8 awg cable on this and on sub

    The sub is earthed on one of the seat mounting studs, but to use this makes the earth cable longer. I'm sure I read somewhere that the earth cable should be as short as possible?

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    Regular Member parapaul's Avatar
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    Quote Originally Posted by Ian T View Post
    is the earth point near the rear lights ok to use?
    Or should I fit it to a larger bolt?
    Should be fine

    The sub is earthed on one of the seat mounting studs, but to use this makes the earth cable longer. I'm sure I read somewhere that the earth cable should be as short as possible?
    Yep. Generally good practice NOT to share earth points where possible, too.

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    Regular Member alzsxi's Avatar
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    The important thing with an earth connection is that it is a good connection with the metal and if I remember correctly the earth lead shouldn't be any longer than a metre (I think!). The important thing with a power cap is that is mounted as close to the amp to keep the power lead as short as possible. Hope that helps but I'm by no means an expert though, just an enthusiastic amateur!!

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    Regular Member breezephil's Avatar
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    Yeah, Ideally the Cap should have its own earth, separate from the Amp, I discovered that behind the Passenger Side rear light cluster, where the alarm is mounted, there is a unused hole about 6 inched up from it, that fits an 8mm Bolt through it, bit of scrubbing and the paint comes off - leaves you with a nice earth mount that fits a nice chunky connection.

    But for GODS SAKE DONT DROP ANYTHING BEHIND THE ALARM!!!

    I managed to lose a small socket wrench in there, took me an hour to get it out again lol there is a lot of space - and when you dont have small hands its not easy!!!

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