[commodor47]

The radio on my unit was pre-wired for power along with the speaker wire terminations. Both are located above my refrigerator. That particular 12 vdc wire is blue. The attached thumbnails show where the blue originates from the wall on the right, in the upper refrigerator access (remove the access panel). From there blue power wire snakes to the radio location. You should be able to tap that power wire for your 12 volt receptacle.

Dick