I have a no audio situation in my 94 SL500 equipped with the Bose system. I replaced the Bose amp with one that I purchased that was said to have been tested- no luck. I’m hoping that it is the radio itself or the tuner module. All that said I’d like to replace the radio/head unit with a more modern unit. I contacted Crutchfield today and their notes indicated that the entire Bose system had to be removed- but only on 1994 r129’s. Has anyone successfully used one of the harness adapters (Metra, Scosche, etc) and retained the Bose system? I don’t know if it matters but the vehicle has the factory phone, just in case that changes anything. Thanks!