Roland Franzius wrote:
> RF schrieb:
>> Thanks Tiger.
>>
>> Tiger wrote:
>>> You probably just have to replace the ignition switch.
>>
>> I'll try to eliminate everthing down to the ignition sw. and then will
>> order if necessary.
>>
>>> There is always power to the light switch... that's why you can turn
>>> on parking light when engine is off.
>>
>> Ouch! You're right. I should have noticed. It's looped from the
>> ignition sw. - does not go through it.
>>
>>> Are you sure there are no bunch of brown wires on metal chassis
>>> inside the cluster area? Most MB I worked on has some kind of bunch
>>> of groundings behind the instrument cluster.
>>
>> I had a close look at the diagram for the cluster of instruments and
>> there is indeed a ground shown. However, I haven't found it yet.
>>
>> Some years back I silenced the seat belt buzzer because it was loud
>> and would always run for about 20 secs, which really annoyed me. There
>> was no sensor in the belt latch. I have a built-in reminder to fasten
>> my seat belts :-) and it never fails. I did find a loose brown wire
>> with a 1/4" wide spade connector but I don't see any matching spade
>> connector.
>>
>> There are a few interesting things behind the cluster, including that
>> collection of grounds you mentioned that are hitched to the chassis. I
>> missed it because the felt pad was pushed up too far and held up by
>> the speedometer cable.
>>
>> I found a black plastic box about 2.5"x1.5"x3/4" dangling from 5 wires
>> that are wrapped with tape. Four wires are connected to the box via
>> large blobs of solder and the 5th wire is free but it has a blob of
>> solder on the end and I can't see where it might have broken off from
>> any of the solder blobs. There is one free terminal on the box that
>> has a smooth cover of solder but no evidence that the 5th wire broke
>> off from there. Is it possible that that box is the seat belt buzzer?
>>
>
> Check your radio connections and/or a 12V plug for external gadgets
> (telephone, icebox?). While MB radio is off with ignition key position 0
> many people want radio or cooling even with ignition key off and make an
> extra soldering connection to 15 - battery direct somewhere. So the
> internal 15-connection will be cold a soldering or has fallen off from
> the connector.
I have no external gadgets nor other external
connections.
>> The instrument cluster has 4 round sockets - a little over 1/4"
>> diameter - and two are the connectors for the glow plug and the seat
>> belt light, which is always dark. There are two free sockets but I
>> have no idea what they were for - probably some items that I did not
>> specify when I ordered the car.
>>
>> I haven't yet followed the wires that are connected to the ground
>> behind the cluster.
>> Tomorrow morning I'll have another look, before my garage turns into
>> its usual
>> furnace state these days.
>>
>> Have a great weekend :-) and thanks again for your advice.
>>
>
> Its time now to circulate the model and year of your 240D ;-)
Opps! I missed that one. It is a 240D model -
1983 year.
I have removed the instrument cluster and it's now
connected via the clock
connector only. Surprisingly the metal casing is
grounded and the clock is
still running.
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