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<blockquote data-quote="helotaxi" data-source="post: 4458632" data-attributes="member: 550915"><p>The thing about &quot;allows current to travel through the entire car body&quot; is that current takes the path of least resistance.&nbsp; Imagine the car as hundreds of individual current pathways of different resistance (all of them much greater than a properly sized run of copper wire) wired in parallel.&nbsp; The resultant resistance migh be lower than that of the wire or it might not.&nbsp; You really have no way of knowing.&nbsp; You also don&#039;t know what factory installed components of the car (brake lights, fuel pump, etc...) are sharing which of those pathways with you amps&#039; ground.&nbsp; Shared pathways CAN lead to noise such as a click when you apply the brakes or a ticking in the system when you turn on the turn signal.&nbsp; If you use the same size wire for the powr and hte ground and it is properly sized for the current requirements of hte amp and the length of the run, both will be more than adequate to carry the current with negligible voltage drop and zero chance for noise.&nbsp; That&#039;s all you care about.</p></blockquote><p></p>

[QUOTE="helotaxi, post: 4458632, member: 550915"] The thing about "allows current to travel through the entire car body" is that current takes the path of least resistance. Imagine the car as hundreds of individual current pathways of different resistance (all of them much greater than a properly sized run of copper wire) wired in parallel. The resultant resistance migh be lower than that of the wire or it might not. You really have no way of knowing. You also don't know what factory installed components of the car (brake lights, fuel pump, etc...) are sharing which of those pathways with you amps' ground. Shared pathways CAN lead to noise such as a click when you apply the brakes or a ticking in the system when you turn on the turn signal. If you use the same size wire for the powr and hte ground and it is properly sized for the current requirements of hte amp and the length of the run, both will be more than adequate to carry the current with negligible voltage drop and zero chance for noise. That's all you care about. [/QUOTE]

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