ignition switch problem.

[rckfshdad]

The electrical portion of the ignition switch in my 66 230 sl seems to have come loose from the mechanical portion of the switch. The key turns the cylinder and the steering lock mechanism disengages but nothing electrical happens. How in the world do you access the back of the switch?

[WANT '71 280SEL]

I would think you can access the back of the ignition switch by way of the instrument cluster. Pull the cluster and you should be able to get a better idea of what you have. I have to replace my ignition switch on my 230S, so let me know how this ordeal goes.

Thanks
David

[Mark DiSilvestro]

First decide whether you'll attempt to repair your old switch or buy a new one. These switches have a plastic insulator crimped onto an alloy base which is then screwed into the steering lock. After many years, the three crimped tabs of the alloy base loosen their grip on the insulator, allowing a gap to develop between the internal rotating contacts and the insulator. In severe cases, I've even seen the insulator fall completely out of the base.

First, you need to remove the speedometer to reach the switch and disconnect the battery. Once the speedometer is out of the way, you'll probably need some offset or very stubby screwdrivers to remove the three screws that hold the switch base to the steering lock, and the screws for the wire terminals, noting which wire goes where. Perhaps draw a diagram showing locations and colors of each wire. Once the switch is out and the alloy base properly supported on a workbench, a small hammer & suitable punch can be used to peen tight the three tabs securing the insulator. Or you can now install the new switch.

Happy Motoring, Mark

[Mike D]

If it's anything like a W114 there are three screws holding the actual switch onto the tumbler assembly. I had one crack and had to replace it. Pull the instrument cluster and see if that is what happened to yours. Those screws are a booger to reach. I used a stubby ratcheting style screwdriver once I got those frickety-frackety screws started. Stock up on curse words. About the 15th time you drop the screw you'll run out of your usual household supply.

You do have lights and power to the switch?

I see Mark beat me to this post.

[Mark DiSilvestro]

I should've mentioned the dropped screws and curse words!
A small telescoping magnet and a magnetized screwdriver can help. Good luck.

Happy Motoring, Mark