I recently installed a aftermarket radio in my 05 ram, which had the infinity setup in it, and for the longest time I couldn't get any sound to come out, put now I have found a wiring harness that works for the 05 rams with infinity. The harness is made by metra, and it costs around 60 bucks, and you get about 6 feet of wiring with to hook up all the speakers. All you have to do is remove the infinity amp and install the harness. As long as you have a radio powerful enough do power all 7 speakers, the sound difference is better than the infinity. Hope this helps all you guys who are having this problem.