I'm looking for electric scheme for BMW

Hi! I'm looking for electric scheme (wiring diagrams) for BMW in particular 3 and 5 models '88 - '94 (or any others BMW models). If anyone can help me, please let me know! Thanks very much for your help!
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I know they are in the Haynes manuals... they are probably in the Bently (not the car its the maker of the book) manuals also. You can pick up Haynes at any automotive stores. The Bently ones are harder to find but supposably better.