you need one of these:

http://www.corvettemods.com/Corvette...go_p_9382.html

On Monday, December 30, 2013 3:56:44 PM UTC-6, Smarty wrote:
> Having owned C5 and C6 convertibles which have been stored for the
>
> winter, I have become accustomed to using a trickle charger directly
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> connected to the battery for many years. The rest of the car has been
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> disconnected and only the trickle charger has been connected to the battery.
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>
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> The new C7 battery is no longer under the hood. It is in the trunk, and
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> not as easily to disconnect and trickle charge.
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>
>
> My question:
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>
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> Can I trickle charge via the cigarette lighter socket or another
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> auxiliary power 12 V socket which the car also provides? Or do I have to
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> get into the trunk, remove the trunk lining, and then connect directly
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> across the battery as I have previously done for the last 15 years on my
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> C5 and C6?
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>
>
> Any advice would be appreciated.
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>
>
> Thanks.