If the little red light on my radio is blinking does that mean it has power or could it be the internal radio battery keeping this red light blinking? This is on a 1994 e320.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?