Anyone have a wiring diagram

[Mr. BILL]

for a '90 525 radio. There's one in Bentley's, but I want to know what wire mates to what wire in an aftermarket radio. I'm putting in an Alpine. The '90 model is the only one that doesn't have a harness adapter available.

I know it can be done as I had it hooked up before. However, my son took it all apart and didn't write down what went where. The '90 has a real screwey wiring set-up. I figured most of it out, but I'm not sure on the power.

[Martin in Bellevue]

Bruno gots the schitz.
http://www.bmwe34.net/e34main/upgrade/stereo_wiring.htm

http://www.bmwe34.net/e34main/upgrade/Data/Stereo/Old_big.jpg

[Mr. BILL]

Thanks Martin. What has me stumped is, the dimmer memory connection in the pic. There is a red/wht wire that goes thru the connector (shown in the pic) and comes out yellow and a blk/wht wire that comes out of the same connector as white. Those two wires (yel & wht) are the dimmer/memory connection that go into the radio. I connected them BOTH up to the only remaining wire from the radio, the yellow battery wire. Problem was, the dash/interior lights come on, even without the key on.

I'm thinking the red/wht that becomes white, should be hooked up to the yellow (battery) wire fom the radio. But what about the Blk/wht that becomes white?

The other thing I'm trying to remember is how I hooked up the speakers. On a '90 model, each speaker lead connects to the radio with ONE wire! I think I remember having BOTH + & - pairings for their respective speakers, (from the radio) connected to the single correcponding speaker wire from the car.

[Mr. BILL]

Got that sorted out, thanks to Bruno and Martin. You don't need to connect the - wires.