sounds to me like you have the ignition wire for the radio wired to the dome light switch or the alarm door pin. you need to check for a wire that turns on whent he ignition key is turned to the on position. And goes off when the key is off.
Alon
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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon
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