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<blockquote data-quote="maylar" data-source="post: 7751054" data-attributes="member: 541144">First off, when you short your meter leads together you get some number (usually 0.5 ohms or so) that you need to subtract from whatever reading you get after that. If you actually get 2 ohms from the negative battery post to the bolt where that short wire attaches to the body, something is wrong. Yes, it matters and I would think your whole car&#039;s electrical would be misbehaving.Be aware that an ohmmeter forces a small constant current through the circuit and measures the voltage then does the math to get resistance. The slightest external voltage will cause a bogus reading. If there&#039;s any voltage present - even millivolts (thousandths of a volt) - your reading is not real. A corroded battery terminal could do that.I would double check by testing from your amp&#039;s ground to the ground point on the front fender, not to the battery terminal. Pull the amp&#039;s fuse first to be sure there&#039;s no &quot;standby&quot; current that could screw up the reading.</blockquote>

[QUOTE="maylar, post: 7751054, member: 541144"] First off, when you short your meter leads together you get some number (usually 0.5 ohms or so) that you need to subtract from whatever reading you get after that. If you actually get 2 ohms from the negative battery post to the bolt where that short wire attaches to the body, something is wrong. Yes, it matters and I would think your whole car's electrical would be misbehaving. Be aware that an ohmmeter forces a small constant current through the circuit and measures the voltage then does the math to get resistance. The slightest external voltage will cause a bogus reading. If there's any voltage present - even millivolts (thousandths of a volt) - your reading is not real. A corroded battery terminal could do that. I would double check by testing from your amp's ground to the ground point on the front fender, not to the battery terminal. Pull the amp's fuse first to be sure there's no "standby" current that could screw up the reading. [/QUOTE]

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