GX-A422SI - JBL Car Audio Service Manual (repair manual). Page 6

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5
5
GROUND (GND) CONNECTION
Connect a wire (minimum 10AWG – 5.3mm
2
from the amplifier’s GND terminal directly to a 
solid point on the vehicle’s chassis. 
•  For a good connection, use sandpaper to 
clear the paint from the metal surface at this 
chassis location. Use a star-type lock washer 
to secure the wire’s connection.
POWER (12V)  CONNECTION
1.  Connect a wire (minimum 10AWG – 
5.3mm
2
) directly to the battery’s positive (+) 
terminal.
2.  Install a fuse holder for a 20A fuse on this 
wire within 18" (46cm) of the battery’s (+) 
terminal. Do not install the fuse in the holder 
at this time.
3.  Route this wire to the amplifier’s location 
and connect it to the amplifier’s +12V 
terminal. Be sure to use appropriate 
grommets whenever routing wires 
through the firewall or other sheet metal. 
IMPORTANT: Failure to adequately protect 
the positive wire from potential damage may 
result in a vehicle fire.
4.  When you are finished routing and 
connecting this wire, install the 20A fuse in 
the holder you installed near the battery.
Power 
Connectors
Audio System 
Head Unit
Chassis Ground
(bare metal)
20A Fuse 
18" (46cm)
Remote Turn-On
(optional)
>#18AWG (0.82mm
2
) Wire
>#10AWG (5.26mm
2
) Wire 
>#10AWG (5.26mm
2
) Wire
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