Does my 240D need to be rewired to fit this radio? - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 10-05-2015, 07:47 PM Thread Starter
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Does my 240D need to be rewired to fit this radio?

Might be missing something here. Just bought this Becker Mexico and figured since my 240D was wired for a Becker Europa I would not have to change out any of the wires. Every wire seems to fit to the radio except the 12 volt connector that connects to the amplifier. Instead of a rectangle slot such as on the Europa, the Mexico has two circle slots. The person who sold me the radio included wires in case I needed to rewire but they are just speaker wires, nothing that would fit into that 12 volt connector. I don't think it's a good idea if I power the Mexico with the smaller Europa Amp.

Europa Amp (12 volt slot):



Mexico Amp (12 volt slot)


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post #2 of 12 (permalink) Old 10-06-2015, 06:15 AM
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Both of the 12V terminals you are showing are 12V OUTPUT for power antenna and/or Reims adaptor. When the radio is on those will have 12V. Unless you have a power antenna you won't be using those wires. The speaker connectors in the second picture are the things under the black t-shaped and white t-shaped plugs. They are the early style. It is possible that your europa has the later style but unlikely. For both radios, the power supply is a black wire that is alone, coming out of the back of the head unit. The power to the amplifier is provided through the big grey cable that plugs into the amplifier. I _think_ that the second picture shows the 12V out as the type where you stick in a bare wire and then hold it in place with a set screw, which might be missing. I have no idea what the grey cable is that is going into the side of the amp in the first picture - that just looks wrong. That should be a wire going to a power antenna.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #3 of 12 (permalink) Old 10-06-2015, 08:21 PM Thread Starter
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Right completely forgot about the this metal slot. Documenting with pictures as you go along really comes in handy. Looks like it will work.




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post #4 of 12 (permalink) Old 10-06-2015, 08:34 PM
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NO NO NO. The metal tab that you have connected something to is the amplifier ground terminal. The grey cable that has the din plug that goes into the din outlet also shown in the picture has a ground wire associated with it (so the grey cable has a din plug and a ground wire with a slide on connector). The slide on connector with the big grey cable goes on that metal terminal.
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post #5 of 12 (permalink) Old 10-06-2015, 09:56 PM Thread Starter
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Okay, gotcha!



There are three wires coming out of the dashboard as seen below. Two are the black and white connections to the amplifier. It makes sense that the wire is supposed to be connected to the power antenna. I purchased the car with a bent mask and tried to twist it off a few days ago. Tried to pull it out but something was keeping from coming out. Must of unhooked that cable in the process. Thanks!


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post #6 of 12 (permalink) Old 10-06-2015, 10:22 PM
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Yes, the din plug with the slide on connector goes to the amp. The white and black plastic plugs with two terminals go in the speaker outputs from the amp. As for that grey cable with the strange end on it, I can't tell well from the picture. I think you are thinking it is the power antenna power line, but it really looks more like a mangled antenna cable (not the power, but the frequency). Do you have the old radio? Look in it to see if there is part of an antenna cable stuck inside the old radio. No, looking at one of your earlier pictures I see it is a white wire with some sort of covering on it. Unusual. If that's the case (a single wire with a connector) it's to actuate the power antenna. The antenna gets +12V constant and switched +12V from when you turn the radio on. I think you have it sorted now, as long as you have a power wire for the radio... (which is usually a black wire coming out of the back corner of the radio, sometimes with a bullet shaped terminal on the end, sometimes with an in-line fuse, sometimes just bare. That gets connected to either switched +12V or constant +12V depending on whether or not you want the radio to always work or only when the key is turned.
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Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #7 of 12 (permalink) Old 10-07-2015, 03:03 AM Thread Starter
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Fits like a glove, almost. I believe some wires may need to be moved around as it just won't budge.





Heres the antenna cable so I know for sure now that mystery cable does not go to it. May be just a extra cable the previous owner left lying around.




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post #8 of 12 (permalink) Old 10-07-2015, 09:30 AM
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On a 114/115 there should be a metal pin sticking out the right side of the radio. It is about 1/4" round and maybe an inch long. I can't remember, it might screw into the threaded hole on either side of the radio. This is a mounting/aligning pin. When you slide the radio into the dash that pin fits into a bracket that provides rear support for the radio.

As for the mystery wire, I think you should try to trace it and see what it goes to. Unless you are sure it is a power antenna. It doesn't look like a Mercedes wire so a good guess is a power antenna (since that wouldn't be a Mercedes wire). The two hole plug black plastic plug in the photo probably goes into the back of the cigarette lighter.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #9 of 12 (permalink) Old 10-07-2015, 09:38 AM
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Here's the mount that you use with a Becker in a W114/W115 car.

Becker Europa Radio Cassette Stereo Side Mounting Bracket or Side Slide Bracket | eBay

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #10 of 12 (permalink) Old 10-27-2015, 01:55 AM Thread Starter
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Okay back to figuring this out now that I have some extra time on my hands again. Yes indeed that was the exact mount that came with my Europa as well. Pictured below some sort of bracket that screws onto the side of the Mexico to keep the it from popping out if that's even what your referring to. I'll get a short 3 second video up on here today to show the problem I have been having.


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Last edited by Shakedown Street; 10-27-2015 at 01:58 AM.
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