This is a W115, the car would not start today and the glow plug light is on constantly.

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With best regards

Al

Check out the W114, W115 enthusiast website.
http://www.stroke8.org

http://www.w108.org

Join the Mercedes W108 group
http://autos.groups.yahoo.com/group/mercedesw108/

My 280SL restoration

The relay lives by the steering column inside the dash. The relay does not control the timing of the glow plugs, it just clicks on for some time (120 sec?) until you start the car, and also clicks on while cranking.

There is a thermo-time switch on the head which the glow plugs ground to. That is what switches the plugs (and dashboard indicator).

I don't know where the fuse lives, but I do know it's not part of the relay (which is a silver metal box).

-J

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1991 350SDL. 222,222 miles (new motor @ 150,000). Transmission time again...

2012 Passat TDI. 23,000 miles. More space, power, and fuel economy than the Benz
1999 Jetta TDI. 284,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house