Radio Shack 120-2130A - Manual (Page 7)

(Green) + (Violet) +
(Green/Black) - (Violet/Black) -
1. Use a small screwdriver to move (2 ch) (4 ch) on the bottom of the
stereo to (4 ch) (four channels).
2. Connect the gray FRONT RIGHT (+) wire to the front right speaker's
positive terminal. The terminal is usually marked with a plus (+)
sign or red mark.
3. Connect the gray/black FRONT RIGHT (-) wire to the front right
speaker's negative terminal. This terminal might be marked with a
minus (-) sign or unmarked.
4. Connect the white FRONT LEFT (+) wire to the front left speaker's
positive terminal.
5. Connect the white/black FRONT LEFT (-) wire to the front left
speaker's negative terminal.
6. Connect the violet REAR RIGHT (+) wire to the right rear speaker's
positive terminal.
7. Connect the violet/black REAR RIGHT (-) wire to the rear right rear
speaker's negative terminal.
8. Connect the green REAR LEFT (+) wire to the rear left speaker's
positive terminal.
9. Connect the green/black REAR LEFT (-) wire to the rear left speaker's
negative terminal.
Connecting One Pair of Speakers
If you are using only one pair of speakers, follow these steps to connect
the harness to the speakers.
1. Use a small screwdriver to move (2 ch) (4 ch) on the bottom of the
stereo to (2 ch) (two channels).
2. Connect the gray FRONT RIGHT (+) 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 REAR RIGHT (-) wire to the right speaker's
negative terminal. This terminal might be marked with a minus (-) sign