lighter polarity for charging

[WmWatt]

Is the cigarette lighter centre positive?

I want to hang a solar trickle charger I picked up at a garage sale in a window of the house and hook it up to a cigarette lighter transformer to charge USB devices for free and need to get the polarity right. Thanks.

[Dragonhealer]

Yes, the outter housing is ground, center button positive.
but is not continuous with the battery when key is off, unless it has ben rewired.

[FestYboy]

Correct, the port is switched via the ignition.

[ryanprins13]

You wanting to use this in your house or your car?
Standard is centre positive. Easy to remember if you think of how the fuse is always connected to the centre post and spring.

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[WmWatt]

In the house. Hanging the solar panel car battery trickle charger from Canadian Tire in the window to charge camera, phone, GPS via the cigarette lighter transformer.