If the cigarette lighter has been in use for cigarettes ... it could be that the contacts within lighter outlet contact points are heat damaged and connection to auxiliary device may not be made electrically ... You could test if you had a voltmeter ... but if you can visibly see heat damage... perhaps you could try scratching any obvious tarnished metal contact point with screw driver... . (the central contact point is the one that is likely to be tarnished requiring cleaning) unless it is a loose electrical conection gone bad... but that would require removing the cigarette lighter.
Note: recommend to remove the cigarette lighter fuse before attempting to insert a metal object into the cigarette lighter... else sparks may fly and the fuse will/or should blow.
good luck.
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