I just got a 1979 240d w/170K. The glowplug light would come on only if I turn the key on and off several times. I just replaced the glowplugs but still the same. (no yellow light) Any suggestions?

I never had this problem with either of my D's, however it would be logical to check the ignition switch for a short (or loose wire) or the glow plug relay. My 380SL had a similar problem with the climate control. Sometimes I'd have to jiggle the ignition key to get things going.

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Current: '86 420SEL, '81 380SL
Previous: '79 240D, '70 280SE, '81 300D.
Just about 600,000 miles on Mercedes products.

Where is the relay located on a 1979 240D. I know where it is on my 190D. But I'm lost on this one. Not much under the hood either.

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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