Another close up of the contacts. I tried running 600 grit sandpaper through them while assembled, but the pitting was too deep.

I removed the two contacts. They are attached together and all it takes is removing the small spring at the rear. See the other pictures for the spring.

Once the contacts were free, I cradled the relay in my palm and pressed the contacts against the top of my work bench, where I had 280 grit sandpaper at the edge of the bench. I worked the contacts left to right across the sand paper.

The larger one had such deep pitting that I filed it with a fine file, then went back to polishing with the left to right motion on the bench and sandpaper.

Attached Thumbnails

 

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Turbo300Mercede
87 300D W124
83 240D W123
80 300 TD Wagon W123, 4 Speed from 79 240D, SLS Rear Suspension