Cigarette light port problems

Check that dead center of bottom is 12v positive and the sidewalls are ground with a test light. The other wire is no doubt for a light.

IMO (and I smoke and never use them) they are horrible for lighting and lousy as power ports which you could get instead and fit in the same hole. They work much better for all the stuff you might charge or use it for.

Watch out for any of those that get left open/exposed as then catch coins and stuff that shorts them out. Get a plug or something to cover the hole. In fact if used to light cigar/cigarette they used to rust and fail pretty quickly,

T