In the 1997-2004 Chevy Corvettes there are no 12 volt accessory wires currently in the factory harness making the installer run an accessory wire to the fuse box or underneath the steering column when installing an aftermarket radio. The XSVI-2004 is designed to provide a 12 volt 10 amp switched accessory output along with the rest of the wires needed to install an aftermarket radio. The R.A.P. (Retained Accessory Power) function, where power is supplied to the radio after the ignition is shut off until one of the doors are opened, is retained by the XSVI-2004.