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Message: <blockquote data-quote="Mitchell Fosgate III" data-source="post: 8877925" data-attributes="member: 691623"><p>There is still power in the radio.  Internal amplifier in the radio. Even when turned off.  The radio is connected to external power amplifier.  Now cannot be turned off, even when engine is turned off.  It should die off automatically.  If it doesn't it's not going to drain your car battery because the ignition switch is a switch that controls the electric or power to the amplifier.  No power should go into the amplifier then.  At engine turn-off.  How can you check.   At the terminals of the input for car amplifiers and output for radios.  Speaker level inputs and pre-amp level outputs.  Connections at these points with the multi-meter.  Reading should be down to zero volts after it cools down.</p></blockquote><p></p>

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