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Re: Wiring new radio on 88 with fade switch (archive)

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Posted by jjp on October 09, 2001 at 03:48:51:

In Reply to: Wiring new radio on 88 with fade switch posted by otis 88 735il on October 08, 2001 at 19:35:02:

To keep the factory amp you will need to run the antenna lead to the amp trigger on wire, There is also a common ground to this system and you will only need one set of speaker wires from the new radio. I used the back set, but I don't think it matters. As for the fader switch , NOTHING will get wired directly to this switch. The reason for wiring this wayis so that you keep the amp cause it has all the crossovers built in to run the 10 speakers. The old radio should be marked on the back (ingraved) which wire is what.
Let me know if you need more information. Have had mine in for 4 years and works great.

I need help wiring a new radio into an 88 735iL with the fader switch to the left of the radio. I have the bentley manual, but I do not understand the fader switch connections and want to disconnect it. I bought a C33 BMW head unit which I thought (hoped) would connect directly, but it does so only on 91 and newer models. I plan to buy a pin adapter with wires to wire it in, but I need help. I know many of you have put aftermarket stereos in using the stock amplifier which is what I want to do. Can anyone guide me in the installation? It should be the same as putting any aftermarket stereo in. I need to know where to connect into the front and rear speaker wires to the radio and keep the amplifier working. Any help would be greatly appreciated.


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