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  #1  
Old 12-22-2018, 11:20 PM
POB POB is offline
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Join Date: Mar 2016
Location: Seattle
Posts: 10
New stereo connection to mystery wires

So I was installing a new stereo in my car and removing an aftermarket installed by the PO. I have followed the many fader disconnection posts here (thanks guys!) but found that the PO's stereo was not connected to the OE stereo's ACC, battery, ground or illumination but it is connected to some wiring that I have no clue what it goes to.

This mystery wiring has the same harness connection to the cigarette lighter as the OE stereo connection. This wiring is original to the car but I have no clue what they tapped into.

Any help to ID what the stereo is getting the ACC signal, battery and ground (no illumination) from? Should I wire my new stereo to the OE stereo's connection and tape off the the PO's hack or just use the same cables? Any help is much appreciated!



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  #2  
Old 12-23-2018, 01:57 AM
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Join Date: Jun 2006
Location: Southeast
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Call Crutchfield

They know everything. Buy all of your audio components from them to help them out in return.
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  #3  
Old 12-23-2018, 02:03 AM
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Join Date: Apr 2011
Location: Colorado
Posts: 904
A multimeter is really all you need. Find out which wire has voltage with no key (battery power), then which ones have voltage only when the key is on (switched power). Stock wiring on this is always going to have brown wires for ground, but again you can use a multimeter to see which wires have continuity to the chassis of the car.

-Rog
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Old 12-23-2018, 12:54 PM
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What year / model car do you have?

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The OM 642/722.9 powered family
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2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

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