I might grab one of these just to try, but I don't think it'll work. Those units all have optional aux. inputs. the 7845 does not.I used this with my old alpine cda 7864, 7863, and 7894
ALPINE AI-NET DIGITAL AUX CHARGER ADAPTER 420i ipod A7 - eBay (item 110309598805 end time Dec-28-10 08:31:37 PST)
The 3.5mm jack is to small for the iPod thats what causes one side to work and the other not. Grab a RCA to 3.5mm from monoprice. The premium set. I had one and it worked well until I dropped it.I did that, but only got sound out of the right side.