INSTALL JENSEN RADIO

There should be a label with all the wiring on the player/radio itself.

Yellow goes directly to battery to hold memory
Red is for ignition switch to power on
Black is ground
Blue is not used unless you are power an amp or other accessory.

All other wires are for speaker wires.

You can get a quick connect harness so you don't have to cut your factor vehicle wiring. If you did do this already, you can go to installer.com to find out which wire is for what.