There are invertors from 120v to 12v,,, then I'd plug another accessory that has the typical cigarrette lighter end into the invertor, then cut those wires and splice.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15