Car: 2006 Chrysler SRT8
Join Date: Apr 2007
Thanked 1,991 Times in 1,800 Posts
Congrats on the new head unit.
It's not a power issue with aftermarket head units, it's the digital signal input that needs addressing, hence the need for the harness adapter.
The PacAudio C2R-CHY4 is what I'd recommend. It's for replacement radios with navigation inputs. Retails around $130 on their site, available online for a lot less than that, like on Amazon at $67.49