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Message: <blockquote data-quote="helotaxi" data-source="post: 3476736" data-attributes="member: 550915"><p>Retake electrical 101, you failed.  The point of zero potential in a system is ground.  That isn't the chassis.  It's the negative post of the battery with the car off or the case of the alternator with the car on (which if you've done even the most basic of electrical upgrades to support your system should be connected to the battery neg post by way of the engine block ground with a large gauge cable).  The chassis only acts as a buss bar to simplify wiring.  It's connected to ground, but it isn't always adequate depending on the amount of current that you're asking it to carry.</p></blockquote><p></p>

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