I just install AVIC-Z1 in my Mustang 2007 and my amp does not work they only way i can make them work is by apply a ground on my RCA ground side but all my ground on my radio are double check and OK can some one help me i use they original ampl that come whit the car.
Thank's

Did you get the wire harness from crutchfield it makes it a whole hell of a lot easier. I did not have this problem, my amps work fine.

Heres a good link also, you know you will need a 5V regulator so your speakers dont pop.

http://www.mustangforums.com/m_1399311/tm.htm

I am having the same prob...I built the voltage regulator thing...and verified the voltage to the ford harness (5v) but yet no audio from the amp'd speaker...