I recently posted a thread asking some questions about the install of 2 12 inch subs and an amp. I am also trying to install a new head unit with that. The problem is, it will not turn on. I have the correct metra aftermarket harness, and i believe everything is plugged in correctly. I checked the fuse under the steering wheel, the fuse in the back of the head unit, and the fuse in the engine bay, they all are fine. There is even power going through the two harnesses (I checked them). What could this possibly be! Even best buy could not figure it out. It is not the ground either, that has been checked. PLEASE HELP!

 

I'm betting a bad pin connection or wiring connection within the harness. Did you install/plug in the antenna? You must install the antenna for some HU's to work as well.

 

there is no ground wire in the wiring harness, look at the black wire and follow it to the vehicle plug you will see there is no cable in the other end cut the cable from the harness and attach it to chasis