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Message: <blockquote data-quote="ultimate157" data-source="post: 2439600" data-attributes="member: 566638">It helps in a few ways.  The stock wire is getting old.  Old wire corrodes, rusts, and breaks strands as it ages in the life of an automobile engine compartment.  This causes more resistance and less amperage to actually get to the battery.Second, the most important of the big 3, IMO, is the battery to chassis ground.  If you put in a run of 4, 2, or 1/0 to the amp, and a corresponding ground from the amp to the chassis, then you're still going to have to go through the chassis to battery ground wire to complete the circuit.  That is why anybody installing a system should upgrade that one first to one size bigger than their power wire.  It's not just the amplifiers running through that wire, you also have the rest of the stock electrical components grounded to the chassis.</blockquote>

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