That goes to the remote turn-on terminal on an amplifier if you have one. That way when you turn on the head unit, the amp is powered up as well. If you don't have an amp, wrap any exposed wiring in that wire with electrical tape and tie it off - you won't need it.
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That goes to the remote turn-on terminal on an amplifier if you have one. That way when you turn on the head unit, the amp is powered up as well. If you don't have an amp, wrap any exposed wiring in that wire with electrical tape and tie it off - you won't need it.