Optimus 120-2152 - Manual (Page 7)

screw attached to a metal part of the vehicle's frame. Be sure
that the screw is not insulated from the chassis by a plastic
part.
3. Connect the red power wire (with in-line fuse holder) to a point
in your vehicle's fuse block that has power only when you turn the
vehicle's key to either the accessory (ACC) or START position.
This connection turns on the stereo when you turn on the ignition
or turn the key to ACC, and turns off the stereo when you turn off
the ignition. This prevents your vehicle's battery from being
drained if you leave the stereo on when you turn off the ignition.
4. Connect the yellow power/memory wire (with black transformer and
in-line fuse holder) to your vehicle battery's positive (+)
terminal or to a point in your vehicle's fuse block that provides
a continuous source of 12 volts.
This connection provides power for the stereo's components, and
continuous power for the stereo's memory when the ignition is
turned off.
5. Connect the blue/white wire to any optional equipment, designed to
run from a switched source, that you want the stereo to turn on
and off (such as a booster or a power antenna).
This wire does not provide power to the components. It simply
turns them on or off. If you do not use this wire, secure it with
a wire tie and do not let it touch metal.
Connecting an Equalizer/Booster
If you are connecting the stereo to a separate equalizer or booster, you
need additional wires (not included).
To increase the total power output from your system, connect the stereo's
LINE OUTPUT R-CH WHITE jacks and blue/white wire, if necessary, to the
equalizer or booster.
Check the equalizer/booster's owner's manual for directions.
Connecting One Pair of Speakers
If you are using only one pair of speakers, follow these steps to connect
the harness with the 14-pin connector to the speakers.