leeb,

In the first few years of the 123, 240D the relay was in several locations, but I believe that if you take out the instrument cluster, you will find it directly in front of the instrument cluster opening, mounted to the inside of the firewall.

Good luck,

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Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles