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<blockquote data-quote="helotaxi" data-source="post: 3153384" data-attributes="member: 550915">Ground loops in the generally referred to car audio sense are differences in the ground path resistance between two components in the signal chain that use ground as a signal reference.&nbsp; The component with the higher resistance on its power ground will then partially ground through the signal cable and the result is ripple voltage form the alt finding its way into the audio signal.If you are grounding to the battery anyway, there is absolutely no point in adding another ground for the amp to the chassis.&nbsp; The battery is reference ground anyway.&nbsp; The chassis is grounded to the battery, not the other way around.As far as testing the resistance of a grounding point, if you can measure the resistance with a normal DMM, it&#039;s too high.&nbsp; 20ft (which is a really long ground in a car) of 4ga copper wire has a resistance of 0.005 ohms.&nbsp; That is the max resistance you&#039;d be looking for if you were running a system that needed 4ga power wire.&nbsp; That is much smaller than the min reading on a normal DMM.</blockquote>

[QUOTE="helotaxi, post: 3153384, member: 550915"] Ground loops in the generally referred to car audio sense are differences in the ground path resistance between two components in the signal chain that use ground as a signal reference. The component with the higher resistance on its power ground will then partially ground through the signal cable and the result is ripple voltage form the alt finding its way into the audio signal. If you are grounding to the battery anyway, there is absolutely no point in adding another ground for the amp to the chassis. The battery is reference ground anyway. The chassis is grounded to the battery, not the other way around. As far as testing the resistance of a grounding point, if you can measure the resistance with a normal DMM, it's too high. 20ft (which is a really long ground in a car) of 4ga copper wire has a resistance of 0.005 ohms. That is the max resistance you'd be looking for if you were running a system that needed 4ga power wire. That is much smaller than the min reading on a normal DMM. [/QUOTE]

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