Optimus 120-2154 - Manual (Page 7)

(Black) - Ground
(Red) - + 12V to Ignition
(Yellow) - + 12V to Battery
(Blue/White) - AMP Remote Turn on 500 mA MAX
1. Disconnect the cable from your vehicle's negative (-) battery
terminal.
2. Connect the black ground wire to a chassis ground, such as a metal
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 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 (such as
the CD player), 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 R (right)
and L (left) line output jacks on the back of the stereo and blue/white
wire, if necessary, to the equalizer or booster.
Check the equalizer/booster's owner's manual for directions.