Join Date: Feb 2007
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I'm not sure on cable size's exactly but are you sure that your sound system isn't trying to draw more power than the battery can handle?
If it is your standard battery then it might not be able to cope with the voltage/current the amp, etc, trying to draw.
Being a 1.2 I suspect the battery hasn't got a big output anyway.
Currently in Mike11's garage:
An LPG powered Ford Focus ST170.