Hey guys, new to the forum. I am the proud new owner of an 81' 240d. It is in really nice shape and has 163,000 miles on it. So far I love it to death. It is not my first diesel, but it is my first Mercedes diesel. My question is about the glow plug light on the dash, it doesn't come on. The plugs and wires are new within the last year. The car came with two controllers. The one he had in the car was apparently supposed to stay on for 30 seconds after the car started to help it clear the smoke faster, and he also had a "stock" controller. Shortly after I bought the car the light stopped coming on. I thought the controller went bad so I just changed it out today with the other one. Light still doesn't come on. I checked the fuse box and there was one bad fuse (c). I noticed there is some kind of temperature sensor thing that looks like it is tied in with the glow plug system. Could that be causing the problem. Thanks for any advice.

A bad glow plug will cause the light to not illuminate. So will a bad light bulb. In either case, the function of the controller is unaffected.

Ok, thanks. I know the dash light is good so I guess I'll check the plugs.

here a some glow plug links for you.

One

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1972 280SE 4.5

The Glow Plug Relay/Controller has a Metal Strip Fues. The Strup Fuse can of coures melt if there is a short circuit but it can also crack.

If you have never owned a vehicle with a Diesel Engine before I would advise taking a look at the below links and learn what it takes to bleed the air out of your Fuel System. If the Air gets between the Fuel Injection Pump and the Injectors in the Fuel Injection hard Lines/tubings it is easy to deaden you Battery trying to Crank the Engine long enough to get the Air out.
The above can happen if you run out of Fuel or if when you change your Fuel Filters you do not Fill them with Fuel or use the Hand Primer to pump Fuel through the system.

DIY Repair Links
http://www.peachparts.com/shopforum/diy-links-parts-category/

http://www.peachparts.com/Wikka/DoItYourSelf

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84 300D, 82 Volvo 244Gl Diesel