Hello. I tried 4 places today and NONE of them had a wiring harness for my 94 945T. I have the CR 814 radio and I have an AMP connector in the back and a rectangular plug. I found the amp next to my steering wheel and it also has the same connectors on it, except the colors of the wires on the rectangular connector are different.

My 91 240 had an amp and I remember getting a wiring harness that had 2 plugs. one pluged into the connector that was originally on the back of the stock radio, and the other went into the connector coming out of the amp. (There where 3 connectors on that amp, one said AMP and the other 2 where rectangular connectors, one input from the radio and one out to the speakers) The amp in my 940 dosen't have connections like that, and how did the colors of those wires change? anyway, how did you go about putting in a new radio BESIDES having the gut at the shop put it in!

P.S. I've installed about 7 radios so I should understand what you are talking about.
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My 91 245

Yeah, the 940 has up to an 8-speaker factory system. My dad's car is a wiring nightmare; it has speakers everywhere. That lends itself to some confusion when installing a new stereo. Some of the speaker wires come from the back of the head unit, and some go through the amp.

This is unnecessary, actually. The two dashboard speakers can be isolated with the front speakers, with a simple high pass, since they're tweeters. The dashboard speakers are powered by an amp.

FOr the 945, you should only have (up to) a 6-speaker system, unless they put speakers elsewhere behind the rear seat. My point is, the factory amps are never very powerful, and you'd be better off just isolating the speakers from the amp entirely. Essentially, you could take the amp out. But you're going to have to do a little bit of wiring that will allow you to get right to the speaker wires, which means you'll have to test for the speakers on the wiring harness coming from the amplifier. Use a AA battery to test for speakers if you're stuck. Like I said, isolate the tweeters, and wire the front and rear doors directly to the head unit. That will give you the most powerful and probably the best combination possible. So far, I haven't seen an aftermarket harness that allowed for total connection to the system. Some improvisation has been necessary.
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Chris Herbst
1992 745, 68k

And others:
93 944, 150k
90 245, 110k
88 744, 160k
87 245, 185k

I put my radio in about 2 hours ago without using a wiring harness. It was too hard to find one. I took out my Dad's old ohm meter and found out which wires where speaker wires and which where power wires. It only took about 2 hours from start to finish and I wrote down the function and colors of each wire I used if anyone is interested in that. Now I just need to modify the stock radio's mounting plate so I don't have to use some stupid looking one.

Thanks
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My 91 245

I don't understand why they can't make aftermarket mount plates to be as close a match as possible to the factory mount plates. I never understood why the aftermarket mounts are inverted. It looks ugly IMO. I was able to use the fatory mount in my '90 760 and the install looks so much better. I originally wanted to put in the radio from an S90 because I hated the looks of those aftermarket mounting plates. I know depth isn't a problem; my aftermarket Sony XR-CA300 cassette deck was actually 1/3" shorter than the factory deck.
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Cullen Wassell / Newmarket NH - '90 764ti / 250,000