RF wrote:
> me wrote:
>> "RF" <RF@[EMAIL PROTECTED]
> wrote in message
>> news:691tvuF2t1h3qU1@[EMAIL PROTECTED]
>>> Roland Franzius wrote:
>>>> RF schrieb:
>>>>> Roland Franzius wrote:
>>>>>> RF schrieb:
>>>>>>> Suddenly my brake and turn lights have decided to go on strike.
>>>>>>> All other lights are ok.
>>>>>>> I did a continuity test on all the fuses and they are ok. The
>>>>>>> bulbs also seem ok.
>>>>>>>
>>>>>>> Anyone have a magic wand for diagnosing the root of this problem?
>>>>>> Depends. Front turning lights ok? Turning and emergency lights
>>>>>> relais (below ash tray) ticking?
>>>>>>
>>>>> Thanks Guys. It's great to have such sup****t :-)
>>>>>
>>>>> Fuse Box: I can't find a ground on the fuse box and the wiring
>>>>> diagram seems not to show one. There is a screw at the lower middle
>>>>> of the fuse holders that seems attached to the chassis and,
>>>>> thinking it might be a ground, I tested it but it is not. There is
>>>>> an infinite resistance between it and the ground pole on the
battery.
>>>>>
>>>>> Plug Connection Cable Harness: This is supposed to be somewhere at
>>>>> the rear of the car and I remember accessing it way back. I removed
>>>>> the spare wheel and the cover of the wheel well on the left side
>>>>> where the cable comes through to the rear but it is not there. I
>>>>> also removed the bulb holder brackets but no sign of it there
>>>>> either. Does anyone know where it is supposed to be?
>>>> Probably not the reason if the front lamps are dead too.
>>>>
>>>>
>>>>> Turning lights: All dead and no clicking when arm is moved around.
>>>>> Also dead: horn,
>>>>> blinkers, brake lights, instrument panel lights.
>>>>>
>>>>> What does work: Main lights, dipped lights, side and parking
>>>>> lights, radio, roof.
>>>> If the sunroof is working cable 15 from ignition key to fuse holder
>>>> and connection 15-16 inside fuseholder is ok.
>>>>
>>>> Sunroof is fuse c) and heating of back window d) at connection 16.
>>>> 16 is connected to 15 inside the fuse box
>>>>
>>>> All other non working (including alternator loading lamp unfused)
>>>> gadgets are at cable 15 at fuses 10 (air fan), 12 (fixed brake
>>>> warning light, brake lights, turning/warning ligths), 14 (horn,
>>>> backwards driving light).
>>>>
>>>> After turning the fuses in their sockets to remove oxidation check
>>>> the voltage at cable 15 at ignition key and the fuses. Check the
>>>> resistance with fuse removed.
>>>>
>>>> This is for the W123 240D.
>>>>
>>> Thank you Tiger and Roland.
>>>
>>> I struggled for over an hour with that instrument cluster. I pulled
>>> it out of its frame but it is very difficult to get at the nuts
>>> behind it and a mere half inch extra would have
>>> made it simple. I'll have another try tomorrow.
>>>
>>> Roland, I am a mechanical engineer and I have long since learned that
>>> simple mechanisms are far more reliable than any others. That's the
>>> reason that my sunroof, windows, seats etc. are all mechanical and
>>> they have never given me a problem and almost certainly they never
will.
>>>
>>> Turning the fuses is an old and effective trick but it did not work
>>> for me, so the problem lies elsewhere. More work tomorrow.
>>>
>>> Thanks again for the sup****t.
>>
>> Just a couple of thoughts; did someone install a trailer hitch on the
>> car at some point? I have seen some horribly butchered wiring
>> associated with trailer lights, and grounds become problematic when
>> they are disturbed.
>>
>> The other thought is that certain types of bulbs were known to cause
>> problems in the Mercedes electrical system. I was told to only use
>> OSRAM bulbs in my old 300.
>
> Hi Me :-)
>
> No trailer was ever hitched to it. I have had no problems with small
> bulbs for years and
> I have never been recommended to use Osram. The four I just bought were
> Sylvania "Long Life." Now all I need to do is to solve my wiring
> problem :-)
A miniscule success - I was able to disconnect the
instrument cluster. At its rear there are the
following connections:
1 A ring of pins about 1" diameter for a round
electrical plug
2 Speedometer cable
3 Oil pressure pipe
4 Three small apparently single wires - black goes
to the glow plug light, red goes to the clock and
yellow to the seat belt light.
That's all - no sign of a ground strap or other
ground connectors.
Tiger: the signal stalk? You have lost me. I doubt
it's the arm that does the wipers, light dips,
etc. and I can't think of anything else.
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