Focus Fanatics - View Single Post - 2012 Ford Focus K&N Intake kit Released.
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Old 05-18-2012, 02:12 PM   #130
troy-knfilters
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Join Date: May 2011
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What I Drive: 2000 Ford Taurus SE (FFV) Vulcan

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To answer your question, the same as if you disconnect the negative. However the positive being re-connected is more dangerous than the negative mostly because when your tigtening down the positive your tool can touch a metal surface causing a bad arc, if you look at your factory manual under roadside emergencies you will notice that they say to connect the positive first and the ground last.

http://www.motorcraftservice.com/pub.../12focog4e.pdf

Page 315

Troy.
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