Alpine AUDIO INTERRUPT IN
#1
Alpine AUDIO INTERRUPT IN
The Alpine CDA-7894 has a wire labled (Pink/Black) AUDIO INTERRUPT IN. This looks like a Mute function. Anyone have a clue what type of signal to send it? 12v + or 12v - ?
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#2
Registered User
There's an easy way to test it. While the radio is playing, touch the wire to a grounded point...if it mutes, you'll need a relay. If it doesn't, it's most likely a +12V mute circuit. I doubt many radios, if any, use -12V since that's not a voltage commonly found on vehicles.
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