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what is meant by "car audio"? an amplifier will not turn on if it is missing either ground, 12v or 12v accessory turn on. the respective wire colors will be large red wire for 12v battery source, large black wire for -12v ground battery or chassis, thin blue wire for accessory 12v turn on. these wires can be tested for 12v with a multi-meter or a simple test light.

a car radio is basically the same wire design for power up, most radios will need 12v to the yellow wire, accessory 12v for the red wire and chassis ground for the black. test these wires the same way the amplifier is tested and repair any wires not functioning correctly.

if this does not help, respond with more detailed accurate assessments of problem for further advise.

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15y ago

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