Hi,
I just started to replace the Becker Grand Prix unit in my 1983 300D-T and I don't know what all the wires are that go into the back of the unit. If I can decipher what is what, I can start to connect the existing power lines to my new unit. I can identify the speaker wires that plug into the Becker, and I can identify the antenna cable, but I'm not sure what everything else is. There is a rectangular plug that has four wires going into it. What are each of these? Also, There is a stand alone female plug for a flat connector. What is this? Because I'm going to rewire the speakers, all I really need to know is which two wires are for power, and which wire controls the antenna power. Thanks everyone, this message board is great!

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside

I had the same problem with my 420SEL. After realizing that I had no idea what the wires were, I had it professionally installed by the store that I bought my new head unit from. They did it for free since i bought it there.

I guess this doesn't help at all, but I thought I'd comment.

I used a continuity (light bulb) tester and figured out for myself what all the wires are. Thanks anyway though. For future reference:

Brown- Ground
Red- Always on
Black- ACC

Alex

__________________
1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside