Optimus 120-2113 - Manual (Page 8)

If you are using only one pair of speakers, follow these steps to connect
the harness to the speakers.
(connector)
__________
Left |__________| Right
|||| ||||
______(+) White_______|||| ||||___Gray (+)____________
| ||| ||| |
| X __(-) White/Black__||| |||____Gray/Black (-)__X |
SPK. / || || \ SPK.
\ X __(+) Green_________|| ||_____Violet (+)______X /
| | | |
|______(-) Green/Black____| |______Violet/Black (-)____|
1. Use a small screwdriver to move 2 ch/4 ch on the bottom of the stereo
to 2 ch (two channel).
2. Connect the gray wire to the right speaker's positive terminal. This
terminal is usually marked with a plus (+) sign or red mark.
3. Connect the violet/black wire to the right speaker's negative terminal
This terminal might be marked with a minus (-) sign or it might not be
marked at all.
4. Connect the white wire to the left speaker's positive terminal.
5. Connect the green/black wire to the left speaker's negative terminal.
Connecting the Antenna
Connect the vehicle's antenna cable to the stereo's large black antenna
Connector.
Completing the Connections
Make sure you have securely made all other connections, then plug the
harness' connector into the stereo's 14-pin wiring socket. Then reconnect
the cable to the vehicle battery's negative terminal.
Testing The Connections
Turn on your vehicle's ignition and install your stereo's control panel
(see "Installing the Control Panel" in Faxback Doc. # 62493). The display
should light and the currently set time (or 12:00) should appear on the
display when you press POWER to turn on the stereo.