So I connected those 4 wires together. I have not wired up the speakers yet, because I just want to know if this will turn on.
And it did not turn on. Is there something I can check? I wonder why it is not turning on.

thanks

any help guys?

Have you checked all the fuses? Is there power to the red/white and black/yellow wires?

Sixto
95 S420
87 300SDL

im not sure if there is power..
i have a multimeter.but dont know how to use it..
which fuses can i check btw?

http://www.doctronics.co.uk/meter.htm
You can also use a 12V test light.

hi,
I tested the power, im not getting anything.
I put the negative to the brown wire and the positive to the red or yellow wires, im not getting any reading at all.

I remember, before I removed the becker radio, the radio would turn off on turns or over a speed bump . Also, when my mechanic removed it, because my car was leakin power somewhere, which was draining the car battery, he said it was the radio.

Maybe he unplugged something?
I lifted the carpet under the passenger side seat, there were 2 plugs that were unplugged, this black box said becker radio on it.
i plugged the 2 connectors back in and test it again, but still no power.

what else can i check??

thanks in advance.

Could it be the fuses? I read some old postings with a similar problem.

Btw, how much is it to replace all the fuses in the box?
And where can I get these, are they standard? does mb dealer sell them?

thanks

If you are referring to the ceramic fuses, you can get these at Canadian Tire. To check your power, and mind you I have a W126 (85 380SE), not 124, so these might differ, you might consider tapping into the cigar lighter wire to bypass all the old Becker wiring which sounds like it is suspect anyway. Use your tester and check that you get 12V with key to IGN, none when key is off. I think that is the case with the lighter wire. If this works, it will get your Sony powered up for testing.
Also, recheck the black/yellow, should be on/off with IGN, touch multitester - to brown, and also to a clean metal body point, like where all the brown ground wires are ganged together. The + lead of course is touched simultaneously to the black/yellow.

If i bypass all the becker radio wires, and use only the lighter power, would I just have the radio to work when the ign is turned on?

Also, my lighter does not work,
but i'll check this out.

thanks

Aha, maybe the fuse or circuit for radio and lighter are the same, hence this should get closer to the problem area. I don't see in your posts that you have actually checked the radio fuse. Have you?
And yes, normally the head unit only works with ign on (that is, the accessory positon, not engine running position), although my Blaupunkt will work on a timer for 1 hour with no key at all, but this is very rare.
The constant power wire is for retention of memory settings and clock in the radio, while the ign activated 12V wire powers it up only when key is turned to position 1 or 2 (run). Radio can be on or off, power is switched from the ignition.
I leave my Blaupunkt 'on' all the time. It powers up when the key is turned on, off when key is turned off.

hey great help..
so i tested the wires of the cigar ligar,
there are 2 brown and 2 blk/yell.

only one set of them works, i dont know why.
the readin im gettting from these wires is around 12.

so are you saying, I only need to have the blk/yellow to the red from the decks wire harness only and this won't be a problem?

and the red/white to yellow is just to keep the clock settings?

Also, could it be the small black box underneath the floor mats of the passenger side? There are 2 plugs that go into this box. It was unplugged when I first checked it out, but even when i plugged it in, there was no power from the cars wires.

thanks.

So if you connect tester lead + to black/yellow, lead - to ground, key off, no power, then turn key to position 1, you read 12V? If so, then yes, connect the black/yellow to your unit's ignition switched power lead, which I assume is the red one.

Yellow is usually constant power to unit, so if the tester shows 12V at the red/white wire, key off, then yes connect this too.:)

Anyone else know what this mysterious black box is under the floormats?:confused:

I dont get anything from the red/white wire..
is there another constant wire i can tape into?

thanks

Ground the tester - lead and try all of the harness wires in there, especially those going to plug in picture 2, until one of them shows 12V with the key 'off'. Have you checked the fuses yet?