Electronic – the polarity of a car cigarette lighter adapter


There is a center pin, and two outside tabs. Which are positive and negative?

Best Answer

Every car that I have seen had center-positive cigarette lighter 'sockets'.

All (as far as I know) modern cars use negative ground systems, so the outer negative 'body' is vehicle ground and positive center is battery

You would expect this polarity to be maintained even with positive ground vehicles made by any sane manufacturer (and most insane ones as well).

AFAIR some old British Vehicles and Volkswagens had positive ground systems. No doubt there were others.