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<blockquote data-quote="loopkiller" data-source="post: 5639647" data-attributes="member: 601690">OP, I would run the wire since you have it. The alternator case is the end point for all grounds. When the alternator is making the power, the electrons have to make it back to the alternators NEG- side (the case) in order to complete the circuit. The shortest, least resistive path to that point is the best. Usually 1/0 wire will have much less resistance than 10 pieces of steel welded together. I would still run ground from every NEG- battery terminal to the chassis as well. This is for any device that uses the chassis for ground and is powered by the battery when th engine is off. Otherwise, those grounds would have to travel through the alt case to get to the battery. That would be bad.The issue with testing the resistance from the trunk to the engine bay would be you would need really long test leads on your DMM. I have never seen DMM leads that long, likely because they would add resistance themselves if they were that long. //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif</blockquote>

[QUOTE="loopkiller, post: 5639647, member: 601690"] OP, I would run the wire since you have it. The alternator case is the end point for all grounds. When the alternator is making the power, the electrons have to make it back to the alternators NEG- side (the case) in order to complete the circuit. The shortest, least resistive path to that point is the best. Usually 1/0 wire will have much less resistance than 10 pieces of steel welded together. I would still run ground from every NEG- battery terminal to the chassis as well. This is for any device that uses the chassis for ground and is powered by the battery when th engine is off. Otherwise, those grounds would have to travel through the alt case to get to the battery. That would be bad. The issue with testing the resistance from the trunk to the engine bay would be you would need really long test leads on your DMM. I have never seen DMM leads that long, likely because they would add resistance themselves if they were that long. [IMG]//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif[/IMG] [/QUOTE]

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