Need help with wiring radio

[Poepoe]

I purchased an Alpine ilx650. While doing the install I noticed the adapter didn’t have a red wire. I’ve researched n researched n can’t find the answer im looking for. Can someone please tell me which wire I can tie into to make it work w the ignition on/off?

TIA

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[rk911]

In my experience with mobile radio equipment (50+ years) the red wire is +/power. Are there more than two wires coming from the rear of the radio?