...but we're a little confused of the wiring. Now I know the yellow gets hooked up to a constant 12 volt supply and the black is the ground, but as far as the illumination and antenna wires I'm not sure. I'd like the CD player to turn on only when the car is turned on, not turn on when the car is off/on...
Has the PV been converted to ALL SYSTEMS 12 volts?
Does the CD player have a dedicated in-face power button?
"...constant 12 volt supply..." If this yellow wire is the power for the CD player it should be extended to the fuse terminal (on the fused side) that gets power only with the key "ON".
"...black is ground..." Don't ground to a bracket/brace/mount/etc. Use a sheet metal screw in an existing or new hole in an under-dash body panel. Be sure the black wire has a round-hole connector to fit under the screw - not a "U" connector.
" the illumination (wire)..." This should splice into a wire that is controlled by the dimmer knob (for dash lights) when the headlights are "ON".
"and antenna wires wires..." Does the car have an outside power-raised antenna?
Is the CD player also a radio? FM?
George Dill