Mercedes C-Class Exterior Pillar Posts Trim Set - Page 3 - Answered Questions & Fixed issues
1985 300D glow plug relay location
The glow plug relay on a 1985 Mercedes 300D is located under the hood on the driver side in the front corner. It is a black box with a black plastic cover on it. If you take the cover off, you can see a metal fuse-able link (a small metal strip that is actually a fuse). If that fuse is burned out, boom there is the problem. The fuse itself can be changed. The relay can also fail internally and it is common to burn up glow plugs when it fails, although that is not the only symptom.
How can I disengage the engine immobiliser?
What year is your car? The immobiliser communicates with your keyfob which has a transponder in it. If you recently gotten new keys, you would have had to swap out the old transponder or have your new one reprogrammed.
Unable to screw the gas cap back on my clk320 after putting gas in the tank
if you happen to drop cap on pavement threads may be damaged, if threads are ok try turning cap counter clockwise a quarter turn then clockwise till cap is tight. Some times this helps cap to seat straight to prevent binding or cross threading, also if it is a locking gas cap make sure it is in unlock position before install.
E350 fuel gauge wont work
the problem is the float attached to the gasoline sending unit the brushes have worn down and are not making contact but could be the cluster also you can detach the cluster and check the leads with ohm meter to detect if the gauge is good or bad
Reverselight switch
have you already checked your fuses? i would start there first before going after the switch
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