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With the system powered on and playing sounds measure the voltage at the speaker terminals with an AC voltmeter. If you measure voltage turn off the system and disconnect one of the speaker terminals and measure across the speaker with an ohm meter. If there is any significant conductance the wire is probably carrying current when the system is playing. Better yet take it to a competent technician.

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Q: How do you know if a wire is carring current for the speakers in a vechiles?
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