Hi, the aftermarket stereo does not use the illumination wire. You must tape that wire off (purple/gray). That wire is either connected to the wrong place or is touching chassis ground and causing your instrument lights to dim.
Connect the stereo's red wire to the car's black/yellow wire; and connect the stereo's yellow wire to the car's red/white wire.
1987 Mercedes 300E Car Stereo Wiring Chart
Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: Black/Yellow
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Purple/Gray
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size:
4? Speakers
Dash
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Yellow
Left Front Speaker Negative Wire (-): Black
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Black
Car Audio Rear Speakers Size:
5 1/4? Speakers
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Red
Left Rear Speaker Negative Wire (-): Black
Right Rear Speaker Positive Wire (+): Green
Right Rear Speaker Negative Wire (-): Black
What happens?
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