Marty from Florida wrote:

Hey all. I'd like to add a 12v power port to hook up my cell charger/PDA/GPS
/ hairdryer and marguerita blender. Any advice on how to get this done, or
is it a shop item? The plane is a 1982 C152.

http://www.powerstream.com/dc1.htm

Had to put one like this in our C152 due to the 28v buss system...

You could undo the connection to the current power outlet, wire that to
the voltage converter and then wire its output to the power outlet.
Total up the amps you'll need, a 200 watt unit should be sufficient...

http://www.powerstream.com/dc1-ap-notes.htm