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Message: <blockquote data-quote="mikelaubach" data-source="post: 7328600" data-attributes="member: 632557">I would disagree with that.  Much of what I work on is battery neg to block and battery neg to frame.But either way, the real reason to ground the block separate from the frame is that the engine sits in rubber mounts in the front and transmission mounts which are also rubber in the rear (on rear wheel drive cars) and sideways on front wheel drive.  The rubber is used to isolate the engine vibrations from the frame (and therefore the seat in the cabin), so it needs to be wired as it is not directly connected electrically (so the alt has no ground as was said).</blockquote>

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