I had the radio from my 560SL out to replace the internal battery which I wasn't able to do at this time. So I reinstalled my radio and it worked just fine. The car's battery was disconnected all the while BTW. Then I disconnected the car battery again to fix my SRS problem. When I reattached the car battery cable, the radio no longer worked. I thought that maybe I didn't firmly attach one of the connections, but I checked them and they are all fine. When I say the radio doesn't work, what I do get is power to the radio. All of the presets work and all of the functions seem to work. It's just that I am only getting a static hum and no sound. Any ideas?

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles