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That depends.

There should be two red power wires on the back of an aftermarket deck. One will be 'constant' power, the other will be 'switched' power.

The 'constant' one always has power, so that radio stations and other settings aren't erased when the vehicle is turned off.

I'm assuming you're not using an adapter harness to connect the aftermarket deck directly to the GM radio harness.(always the preferable option)

Most of the time(when not using an adapter harness) I will locate a pre-existing wire in the dash that is 'constant', and tap into that for the 'constant'.

The 'switched' power can be connected to the factory radio's 'switched' power source. You'll have to figure out which wire that is in the GM harness and connect to that, or (not so ideally) cut that wire and connect it to the deck.

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Q: Where do you connect the red power wire for aftermarket radio in new gm?
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