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I put a new radio in my car and there were 4 wires on one harness red yellow brown and purple. what could the purple be the only thing i notice about it is that the memory is whipped clear every time i turn the car off

By squills Asked Jul 8 2008 9:09PM
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Answer 1 out of 3

by squills on Jul 10, 2008 at 1:05 pm Permalink

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it must be the gray blue and changed color over time. so i guess that wire does nothing for a radio of today
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Answer 2 out of 3

by Josh on Jul 9, 2008 at 5:33 pm Permalink

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What is the year/make/model of your car?
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Avatar squills Jul, 10 2008 at 02:53 AM
its a 1986 mercedes 190e
Avatar Josh Jul, 10 2008 at 08:03 AM
I looked around online, but couldn't find much. What I found doesn't appear to be entirely accurate. You'd probably be better off using a multimeter to test the wires. Pending you test and connect them all properly, you shouldn't have any more wiring related issues.
Avatar Josh Jul, 10 2008 at 08:03 AM
This is all I could find...
1984-93 Mercedes 190 Series Stereo Wiring
Constant 12V+ Red
Switched 12V+ Black/Yellow
Ground Brown
Illumination Gray/Blue
Dimmer n/a
Antenna Trigger Blue
Antenna Left Rear
Front Speakers 4" Dash
Left Front (+) White
Left Front (-) Black
Right Front (+) White
Right Front (-) Black
Rear Speakers 6 1/2" Rear Deck
Left Rear (+) White
Left Rear (-) Black
Right Rear (+) White
Right Rear (-) Black

Answer 3 out of 3

by squirtgun on Jul 8, 2008 at 9:18 pm Permalink

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that would probably be your battery connection. connect it to a hot (charged) wire when the car is turned off and the key is turned off also.
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Avatar squills Jul, 09 2008 at 01:13 PM
does that mean to connect the wire to the red wire for the radio and if so how do i know thats right with out harming anything.
Avatar squirtgun Jul, 10 2008 at 11:50 PM
get a cheap voltage meter anywhere but wal-mart , make sure its made in the u.s.a. and find a hot wire when the key is not in the ignition. this way you know the wire has power when the acc. switch is not turned on. this will keep your radios memory


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I put a new radio in my car and there were 4 wires on one harness red yellow brown and purple. what could the purple be the only thing i notice about it is that the memory is whipped clear every time i turn the car off

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