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Re: <E28> Replacing Factory Stereo

>I'm considering replacing the factory stereo on my '87 535is. It
>cuirrently has what I beleive is a Blaupunkt cassette receiver and
>a trunk mounted amp. A few of the questions I have are:

I just did this to my 88 E30 so there are several things you need to be 
aware of.  If you have the factory stereo with the sliders for bass & 
treble and it has WB, it doesn't have a pre-out to the factory amp it 
just takes the speaker level outputs and amplifys them.  This unit also 
just has left and right outputs, so the fader in the dash divides the 
signal to the four speakers.  You will need to bypass the stock fader 
if you purchase a head unit with a four channel amp.  Finally, the 
system uses a common ground so if you use the factory wiring, you will 
need to run at least a new ground wire to each of the fronts if the 
head unit you are installing requires seperate grounds for the front 
and rears.

Good luck...

Mike