The radio was only connected in the case of the 300D. The 420SEL had no radio connected and the amplifier in the trunk had no power (fuse was removed from the line).

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k