I changed out every part of my system, head unit, speakers, amplifier and added custom box with sub with amp for behind the rear seats.
All works excellent except I've never been able to pick up any AM stations. I've tried all settings on the radio and called Kenwood they are no help at all.
Has anyone else had this issue? Is there a power lead from the factory antenna booster I missed? Any advice is appreciated?

 

I had this exact issue. I went back to my installer and had the system checked out. We discussed this with Kenwood.

The answer that I received wasn't satisfactory, but unfortunately there's not much that can be done about it other than changing to a different brand. I was told that AM radio is not their priority as most people listen to Sirius/XM, FM or other digital sources. The AM tuner that is used is very weak. That, combined with the Porsche AM antenna (which is apparently also quite weak) produces poor reception issues. I can only pick up a few stations, even in downtown Denver.

It's disappointing, because I like talk radio.