radio wiring on 107 sl

I want to install a Becker grand prix 2000 stereo into my 1983 500 SL, but the wiring for the radio is a bit confusing to me:
blue + brown + brown + green/red wires together
red and grey wires together
Can anyone tell me what's this all about - the car is equipped with a power antenna.
Regards, Werner
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The blue is for power antenna.
The brown is for ground... but you said you got two of them?
There is supposed to be two power... one is always constant power 12V and one of them power on only when ignition is on. You will have to use voltmeter/multimeter to figure this out.
Then you have speaker wires... each has ground and positive so in SL, you probably got only two speakers... so that is 4 wires.
I believe the grey wire is for light... it gives you 12V When you turn on your headlights. so you can see your radio at night.
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