In the Ford/Lincoln/Mercury vehicles listed on back there are no 12-volt accessory wires in the factory radio harness making the installer run an accessory wire to the fuse box or underneath the steering column when installing an aftermarket radio. The XSVI-5524-NAV 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 is retained by the XSVI-5524-NAV. The XSVI-5524-NAV also provides essential wires required for aftermarket radios that have navigation. Provided is VSS (Vehicle Speed Sense)/ Reverse/ and Parking Brake. This cuts down the installation time since the installer does not have to look for these wires in the vehicle.