Panasonic CQ-R145U - Manual (Page 19)

Speakers
Identify the car speaker leads. There will be two
leads for each speaker, usually color coded.
A handy way to identify the speaker leads and the
speaker they connect with is to test the leads
using a 1.5 volt AA battery as follows.
Hold one lead against one pole of the battery and
stroke the other lead across the other pole. You
will hear a scraping sound in a speaker if you are
holding a speaker lead.
If not, keep testing different lead combinations
until you have located all the speaker leads. When
you label them, include the speaker location for
each.
Antenna Motor
If your car is equipped with an automatic power
antenna, identify the car motor antenna lead by
connecting one bulb tester lead to the car battery
lead and touching the remaining exposed wires
from the cut radio connector plug one at a time.
You will hear the antenna motor activate when you
touch the correct wire.
Antenna
The antenna lead is a thick, black wire with a
metal plug at the end.
□ Connect All Leads
Now that you have identified all the wires in the
car, you’re ready to begin connecting them to the
stereo unit wires. The connection diagram on
Page 23 show the proper connections and color
coding of the leads.
We strongly recommend that you test the unit
before making a final installation.
You can set the unit on the floor and make
temporary connections to test the unit. Use
electrical tape to cover all exposed wires.
IMPORTANT : Connect the red power lead last,
after you have made and insulated all other
connections.
Ground
Connect the black ground lead of the power
connector to the metal car chassis.
Speakers
Connect the speaker wires. See the wiring
diagram below for the proper hookups. Follow the
diagram carefully to avoid damaging the speakers
and the stereo unit.
The speaker used must be able to handle more
than 30 watts of audio power. If using an optional
audio power, the speakers should be able to
handle the maximum amplifier output power.
Speakers with low input ratings can be damaged.
Speaker impedance should measure 4 - 8 ohms,
which is typically marked on most speakers. Lower
or higher impedance speakers will affect output
and can cause both speaker and stereo unit
damage.
Caution: Never ground the speaker cords. For
example, do not use a chassis ground system or a
three-wire speaker common system. Each
speaker must be connected separately using
parallel insulated wires. If in doubt about how your
car's speakers are wired, please consult with your
nearest professional installer.
CORRECT
No Common Ground
n
INCORRECT
Common Chassis Ground
L *
a ,
rr1
INCORRECT
Speaker Common
(common earth lead)
CQ-R145U
19