I'm often asked about the proper wiring for the typical Blaupunkt radio in the early BMW models and am including a diagram showing the proper locations for all electrical wiring. Earlier and later radios have a slightly different configuration. If anyone has specific questions please contact me through PM or through our website: Vintageblau.com
The wiring process for a vintage Blaupunkt radio is generally a simple procedure. Besides the antenna wire and speaker cables, the only other wires are the positive and negative wires, possibly an automatic antenna cable if it applies to your vehicle model. Where these wires attach to Blaupunkt radios changed over the years though.
No matter what model vintage radio you install, it is important to ground it properly in order to ensure its proper function. Bad grounding will result in sub par performance and a lack of reception. For the typical 1970's models the rear tab (as shown in the image below as #2) is designated for attaching the ground wire. The positive (hot) wire should be attached at the +12V tab and an inline fuse is highly recommended as well.
The 1970's Blaupunkt radio shown in the diagram is a mono Porsche 911 Frankfurt unit. The two speaker holes (as shown in the diagram as #7) take typical banana/push plugs. We recommend using our original speaker plugs for correct fitment. These mono output radios are designed to run either one or two speakers. Speakers should be 8 ohm through the late 1970's. Using 4 ohm speakers will damage the radio over time. Speaker wattage should be kept relatively low and factory specs are always best. For those customers requiring a more powerful system, an amplifier can be installed, allowing for more powerful speaker installation. If you have any questions regarding the specifics for your radio application, just let us know. We are always happy to help.
The speaker plugs for a vintage Blaupunkt radio can be one of two versions. The version with two equal round pins were used throughout the 50's, 60's and early 1970's. About 1974 these were changed to the "pin and spade" type that only allow you to insert the plug one way, thus specifying positive and negative output. Mono radios use one plug, while stereo units require two.
Most Blaupunkt radios beginning about 1965 have an input port commonly referred to as the "DIN input". These input ports allow for external devises such as an external tape player, external short wave receiver or an external traffic decoder to easily be plugged into your vehicles stereo system. While a chrome front shortwave receiver or original equipment external tape may have a decorative quality as an optional accessory to the dash of a vintage car, they generally aren't very useful these days.
The good news is that this port can be used for modern external devices as well such as MP3 players, iPod's, tablets and cell-phones. This allows you to listen to music from your external device through your vintage cars vintage stereo system. Just pull out the rear white cap and plug in the external device cable. Then plug in the small male end into your cell-phones headphone jack, you can now listen to your stored music.
The cables we sell never have to be unplugged from the back of the radios and can stay in place permanently. Other companies only provide cables that have to be unplugged from the rear of the radio when not in use, which is seriously inconvenient. We also have our cables custom made with superior materials in regards to the plugs and wiring.
For further information, restored radios and radio parts please contact us: Vintageblau.com