R class 2006 radio won’t tune in

[grantmackay80]

Hi, I just bought a 2006 R320. The radio won’t tune but everything else works. I bought a replacement radio antenna amplifier to see if that would solve the problem bit it didn’t. When I unplugged the antenna from the amplifier it improved the signal which makes me think that it’s not getting power? Can anyone tell me where the fuse is for the antenna amplifier so I can see if that’s the problem? Or suggest a solution. Thanks in advance.