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#1 (permalink) Old 06-09-2005, 02:38 PM
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I have a 1987 535i and I want to upgrade the stereo. I bought a new head unit and speakers. I am planning to install everything with a friend.

The problem is I cannot find a wiring diagram for the stock radio. I'm not sure which wire from the stock unit correspond to the wires on the new harness. Anyone have a good DYI for an 80's BMW? I couldn't find one on the forums. Thanks in advance.
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#2 (permalink) Old 06-09-2005, 10:00 PM
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they make a harness for your car, that will match the colors coming from the aftermarket radio. This saves you from having to cut the wires in the car. it'll save you a bunch of time and headaches...



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#3 (permalink) Old 06-11-2005, 08:02 AM
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You sure they make a harness for pre-1987? I found plenty of places that have harnesses for 1988/1990+ or 2000+, but none for 1987 or earlier. I did finally find a wiring diagram from an E28 specific forum: http://home.att.net/~ebaines/e28_leads.htm
Thanks again for the advice.
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#4 (permalink) Old 06-12-2005, 07:23 AM
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Nope, your right I forgot about the plug setup on that car. Your's should have the two little round plugs on each speaker. You can actually use the dial-type fader (if yours has it) by using only the front or rear speaker outputs of your new radio. The colors on there should be correct.



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#5 (permalink) Old 06-16-2005, 10:14 PM
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I had to get some body work done so I couldn't get around to my stereo project, but I just got the car back and finished installing the new speakers. So now I'm getting ready to install the head unit. Looking at the lead diagram I found it appears that there is a common lead for the left channel speakers and right channel speakers. Can I just splice the front and rear leads for the respective channels together, giving me one connection for left (+), one connection for left (-), one connection for right (+), and one connection for right (-)?

Also, I was told I might have to modify the wiring due to the fader. Can you give me any advice regarding the fader or what I might have to do in order to bypass it?

Thanks.
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#6 (permalink) Old 06-16-2005, 10:29 PM
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Just use the front or the rear outputs from your new headunit and you can use your factory fader. Tape off the remaining headunits outputs, you want to make sure they dont touch metal or each other.

They use what is called a common ground system. This is why I say use the factory fader. An aftermarket radio uses a floating ground system, which basically means each speaker has its own ground. The common ground uses one ground for 4 (or more) speakers. This is why you cant tie them together.

Hope that helps...



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-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan
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#7 (permalink) Old 06-16-2005, 10:31 PM
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Oops...I forgot, if you decide you want to bypass the factory fader, you will have to run new speaker wires to alll four speakers, you cant use any of the existing wiring.



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-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan
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#8 (permalink) Old 06-17-2005, 09:17 AM
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And it won't matter which- front or rear- output I use?

New Issue: I pulled the stereo out for a look and went down my wire diagram. I found each of the inputs, except the negative speaker wires. There are two knobs with two slots each plugged into the stock head unit. Each knob is marked left and right respectively. And the positive wire for the left and right speaker is coming out of each but there is nothing coming out of the other spot on the knob. I can see where the negative wire comes out of the fader for each speaker, but they don't seem to be attatched to the stereo itself. Is this possible? Any advice?

Thanks.
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#9 (permalink) Old 06-17-2005, 02:40 PM
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Well, I went ahead with it. My brother took a look at it and said that it should work and it did. Now I just have to put in the changer and I'll be set. Thanks for all your help.
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#10 (permalink) Old 06-17-2005, 11:28 PM
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no problem, glad i could help...



-There are 10 kinds of people. Those who understand binary, and those who do not.

-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan
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#11 (permalink) Old 03-10-2009, 03:11 PM
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Sorry to resurrect a thread that should be dead and buried

BUT

da_bull you are a life saver.

On Saturday I bought a June 89 E34 525 - complete with Blaupunkt Woodstock SQR 88 cassette player. Today I bought a couple of connection blocks, an ISO connector kit, and a Blaupunkt Sevilla MP38.

I removed the Fader - and was left with a very quiet system - until I found this thread.

I changed round the connection - relinked the cables where the fader should be - and it now sounds superb.

I know old threads should be left alone - but your help saved the day. Thanks.

For info on the car I bought - MoroccanAdventure@hardmeier.net - Zurich-Tiznit-Zurich or BUST!!!
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#12 (permalink) Old 03-10-2009, 10:10 PM
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Glad that the info still provides help. Enjoy your stay here at werkz...



-There are 10 kinds of people. Those who understand binary, and those who do not.

-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan
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