E28 (1982 to 1988 5 Series) Wiring Diagrams E28 (1982 to 1988 5 Series) Wiring Diagrams 1982 e28_82 (11485465 bytes) e28_82 (7335802 bytes) 1983 e28_83 (11072229 bytes) e28_83 (6912250 bytes) Radio wiring write up • MyE28 BMW E28 5 Series Enthusiast Community. Study the radio wiring with the aftermarket unit. They are pretty basic colors. Red is generally the main power wire. Yellow is generally the memory power wire (keeps power to the radio enough to keep radio stations saved, last point on a CD, settings, etc but does NOT turn the radio on). BMW Bavaria CR II Cassette Radio for E30 E21 E23 E28 E24 Click to view on Bing3:18BMW Bavaria CR II Cassette Radio for E30 E21 E23 E28 E24. BMW Bavaria CR II Cassette Radio for E30 E21 E23 E28 E24. Skip navigation Sign in. Search. Loading.. Close. This video is unavailable.Author: Old Car Radio ChannelViews: 226 E28-535i This may not work for every E28. E28-535i is not responsible for any damage you might do to your BMW E28 as a result of interpreting and/or using this as a repair guide. For corrections or suggestions, contact me using the link on the left hand side. Lets Talk e28 Stereo Replacement • MyE28 General conversations about BMW E28s and the people who own them. 13 posts • Page 1 of 1. Lets Talk e28 Stereo Replacement. by mcm97 » Dec 10, It turned out to be something with the factory amp and the aforementioned shitty wiring. Remove it. BMW E30 wiring diagrams, PDF download - BIMMERtips OEM BMW E30 3 series wiring diagrams are helpful when diagnosing and troubleshooting electrical issues or wiring electrical components. These are official BMW wiring diagrams from BMW North America. The purpose of the manual is to show electrical schematics in a manner that makes electrical troubleshooting easier.