1990 m119 will not turn over

[dangill]

Yesterday installed bosch platinum plus 4 plugs.
Car started and idled ok for 2-3 minutes.
I turned it off to do some other work and now
it will not engage starter.

I have since read all the negative posts re: platinum
plugs and want to know " Is there a relay or sensor
in this 500 sl that would sense a high current draw
by the ignition system and shut starter circuit down"?

I have been having intermittent starter switch problems
recently and am worried my choice of plugs blew something
else up?

Thanks
dan

[bobterry99]

The platinum plugs can have nothing to do with the failure of the starter to turn over. The circuit is simple: terminal block to ignition switch to Park-Neutral safety switch to the starter coil.

[tecqboy]

The ignition switch in this vehicle is notorious for failing. Do a search for info.

[dangill]

Thanks Guys,

There is no doubt that poor connections are the problem.
After seeing bob's post i went in the garage and in about
10 minutes had the multipin connector off the switch.
Depending on how much pressure I put on the rear of the connector
I could make it fail or make it work.

The rear of the switch barrel seems to be anchored in a fashion that allows
some pivot movement. I can't seem to be able to feel or find a screw or stud
where the barrel attaches to the mounting (part of the steering column
casting).

Do you have any suggestions for removal ?

Bobterry99,
thanks for your last answers to my slooooooow rear deck lid.
I checked for leaks, (none) and low fluid level (ok).
The rear deck lid closes normally and the top cycles normally.
The rear lid just opens very slowly.

I think it may be worthwile to just replace the cylinders.

What do you folks think???

Thanks
Dan

[bwheitman]

Check out our website at www.mbva.org/northtexas, there is "repair videos" on the left table towards the bottom, there you will find a video on how to remove the ignition switch in a 129. Good luck!
Brian

[bwheitman]

oops www.mbca.org/northtexas sorry

[dangill]

Thanks to bwheitman's great website I was able to remove the switch in a few minutes.

Thanks
Dan