PeachParts Mercedes-Benz Forum - View Single Post - w126

whunter · #6 10-03-2004, 10:14 PM

Quote:

Originally Posted by daverdla

I drove about ten miles this morning and noticed that all of the instruments, except the clock, stopped working. The car runs fine and everything else seems to work. I checked the fuses. All okay so I rotated each one. Still no instruments. I also noticed that the big relay was buzzing when I turned on the ignition like a relay was closing all the way. I pulled it out and put it back. Still nothing. I don't believe this relay controls the instruments but maybe I'm wrong. Any suggestions?
Thanks
Dave

The buzzing relay indicates a primary ground is broken; it is trying to back feed.

Now, your second clue is the sudden failure of the instruments.

The only thing all W126 instruments share is the central ground point.

Sad to say this ground point is roughly six inches behind the instrument cluster, and can only be reached by pulling the cluster out.

You will need the special tools and a large batch of patience, to get the cluster out without secondary damage.

I would wager that both issues are the same ground lug.