Upgrade the firmware of the black box first!!
2005 Dodge Ram 3500
I purchased the chto-02 harness for my 2005 Dodge Ram 3500 and at first nothing worked. The deck didn't even turn on. Ive installed many stereos in my time and I followed the instructions exactly! I called up Crutchfield support and they told me to run switched power to my cig lighter. I did that and the deck finally turned on but got no sound. After trying everything I could think of I decided to plug the black box into the computer with a micro usb cord and see if the firmware needed upgrading from AXXess's website. It upgraded the box from version 1.0 to "1.0" thinking it did nothing I plugged everything in and EVERYTHING worked how it should. I didn't need to run the separate switched power anymore and I even have FADER which the manual said 2005 Rams would not have Fader. Hook up all the wires exactly how it is in the instructions and you will be good to go!! Crutchfield's technical is the best I've ever come across and would definitely order from them again! They were very polite and helped in every way.