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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7421815" data-attributes="member: 576029">a quick question but no quick answer.  sorry about that.your DMM isn't accurate enough to measure grounds directly.  you need to operate within it's range.  for that meter, you should use a resistor as well so you are within the normal range of the meter.  a 100 ohm resistor would be perfect.  start by measuring the resistor + wire leads directly.  then add in the ground resistance and take the difference.you should measure less than 1 ohm between amp ground terminal and battery negative terminal.  less than 0.5 is preferred.  note that there will be resistance in the connections between the DMM and the terminals as well, a few tenths at least.</blockquote>

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