BenzWorld Junior Member
Date registered: Mar 2008
Vehicle: 1987 Mercedes 300D, 1983 Mercedes 240D
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Glow plug indicator (and more) -- 1987 300D
The last advice I got regarding the start-up smoke was helpful, and I discovered it smokes much less if I keep the glow plugs on past the time when the indicator light goes out. Thanks!
Now another related (?) issue has arisen: the glow plug indicator light stopped working this afternoon. I did a search of the problem here and got to dieselgiant. Tested the plugs' resistance at the socket; 4 out of 6 were below 1 ohm and 2 at 10 ohms. Got good voltage going to the relay and at either end of the fuse strip. Also got good voltage coming out of each pin going to the plugs. For good measure we tested voltage where the wires screw to the top of the plugs -- still good. And although I haven't tried to start it from an overnight cold temperature, it sure seems like it starts just like before after sitting several hours. In conclusion, the system seems to be operating normally, just the light doesn't work.
So given all this, would it be safe to assume that the plug indicator light simply burned out? Or is there some other small relay, fuse, etc. that would cause the light to not work? And if it is just the light, how much of a hassle is it to replace an instrument light in the dashboard? (In my old Saab 900, you can reach most indicator lights by going down through the dash speaker hole.)
Additionally, the cruise control began operating erratically this afternoon -- it would accelerate, but not hold speed, until after running at speed a little while. Maybe that was because of a problem with the brake lights, though, as the computer was changed out last week, and I discovered a brake light bulb loose in the socket (while changing out a burned out marker light). Still was erratic after reseating the buld, though. Does the computer need time to reset itself after resolving the problem?
Thanks for any input anyone can share.