Yellow wires on the back of atermarket HU's are switched (ignition).
Red is constant 12 volt.



So, the brown wire from chassis goes to black wire (I dont do this)
The black/yellow wire from chassis goes into the yellow wire of HU.
The Red wire from chassis goes into the red wire of HU. I am still looking for a wiring diagram.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.