[R129 SL] Electrical problems

[Oldbenz1 at aol.com]

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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