[TR] Positive Ground Accessory question

[Carl TR]

Red letter day last Saturday.  The TR3 tub (et al) came back from the body 
shop.   Going to do some test fittings over the next couple weeks and then 
it goes to the next step... paint/finish.     Target date for on the road is 
now within sight: July 1, 2009......

In the meantime - thinking about long trips and no radio.   Is there some 
way to hook up accessories (cd/mp3) to a positive ground electrical system. 
Or will a 'cigarette lighter' receptacle work (doesn't seem likely in my 
pebble brain).   Not planning on an alternator conversion.

Thanks.
Carl
1961 TR3 - TS81802LO
Tampa, Florida