[R129 SL] Electrical problems

[Wesley, Bob]

Rich,

 

I have a similar problem on a very intermittent basis with my '92 as
well.  When I signal for a left turn the warning lights will all flash
on for a second.  This doesn't happen very often but is always
disconcerting.  I have not experienced the cruise control or wiper
issue, but I rarely drive this car in the rain (Doesn't rain much in San
Diego, Ca.). I will be interested to hear if anyone else has had a
similar problem and has a fix.

 

Bob

 

________________________________

From: r129list-bounces at mbcoupes.com
[mailto:r129list-bounces at mbcoupes.com] On Behalf Of Oldbenz1 at aol.com
Sent: Tuesday, June 05, 2007 8:23 AM
To: r129list at mbcoupes.com
Subject: [R129 SL] Electrical problems

 

On a recent long hiway trip,  the '92 500SL was exposed to one of its
rare rain experiences during which I discovered some annoying problems.
Wiper switch was intermittent, with the low-speed and interval wiper
settings working only occasionally (mostly not at all).  Fortunately,
the high speed wiper position was OK so I was able to drive safely.
Also, when signalling lane changes, the cruise control would act up,
sometimes shutting off, other times speeding up as when the cruise lever
is moved to the "Accelerate/Set" position.  When this happened, the
warning lights on the instrument panel would go crazy so I felt like I
was playing a pinball machine- different colored lights flashing
everywhere, fuel gauge instantly dropping to zero, red oil pressure
light and seat belt light flickering, etc.!    This anomaly was seen
whether the wipers were on or  not.  I suspect the combi switch is the
culprit, although maybe there is a wiring harness in the steering column
that is at fault.    My question is can the combi switch be taken apart
so electrical contacts can be cleaned?  Failing that,  is replacement of
the combi switch likely to solve these problems?  My concern is the
cruise control problem that shows up when signalling lane changes- it
would seem that the combi switch functions and the cruise control would
be two separate systems.
Rich


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