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Wire color and function
The audio and power input wire colors are an EIA standard for car stereo applications
as follows:
Yellow = battery +12v input
Black = ground input
Blue = remote +12v output the above power wires can be connected directly
to the amplifier being added
White = left front (+) input
White/Black = left front (-) input
Gray = right front (+) input
Gray/Black = right front (-) input
Black/White = reference ground (-) (reference ground optional if noise is present)
Note: Be sure that all audio input connections are polarized or in phase with each other.
Failure to do this will result in poor bass response and low quality audio.
Adjusting the LOC for maximum performance: After completing all of the necessary
connections, turn the LOC adjustment pots all of the way down by rotating them completely
counter-clockwise. Now, turn the stereo system on and adjust the main volume control on
the stereo to approximately ¾ maximum volume. Select one of the adjustment pots on the
LOC and turn it slowly clockwise until you notice audio distortion and then stop. Turn the
remaining pots to the same position as the previously adjusted pot. The audio set-up of the
LOC is now complete and ready to be enjoyed.
Metra recommends MECP
certifi ed technicians
INSTAX-MLOC720
Caution: Metra recommends disconnecting the
negative battery terminal before beginning any
installation. All accessories, switches, and especially
air bag indicator lights must be plugged in before
reconnecting the battery or cycling the ignition.
Note: Refer to the instructions included with the
aftermarket radio.
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