Radio Power Wiring

Possibly dumb question...

I know blue/purple is illumination.

Yellow/purple? are both constant power.

Black/Black Grey is front center speaker.

Question is, do you need to use BOTH yellow wires together for aftermarket radio power?

 

You need whichever wire supplies 12 volts when the key is switched on...

 

Will check what has power with key on, was more confused that there are two yellow wires. Have not seen consistent discussion on this topic.

 

Leave as is, nothing more than a splice feeding elsewhere(per owners manual, backup lights & windshield washer).

Cut apart one will be dead, and something will be missing power.

 

That makes more sense to me now, thank you.