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Old 1st Jun 2020, 3:07 pm   #3
Brigham
Octode
 
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,111
Default Re: Cigar lighter socket polarity?

The centre pin is live, the case is earth.
If in doubt, check the battery terminals for polarity. The 'earth' terminal goes to the chassis and engine block. On most cars, this is the Negative terminal.
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