Hmm.

You do have the single brown with blue stripe wire connected? When I left that one off, the radio only worked partially, as you described (on and off without the key, etc). Upper driver's side next to a four wire connector if I remember correctly.

I do not have a wiring diagram handy, so can't help.

You could also have a loose wire at the ignition switch, the switches do actuall fail once in a while.

Main problem I had was a loose fader so that while the radio was actually on, no sound.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!