Quote:
Originally Posted by funola
Are you sure about that (glow plugs on while cranking)? Logically, one would think that Mercedes, by using good design practice, would put a relay in the circuit to cut power to the glow plugs while crranking in order to deliver full power to the starter. I can't do a test on my car since I've modified my glow plug relay to manual operation. Could you run a test on yours (provided it has not been messed with) and report back?
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Actually what Mercedes did is sort of idiot proof the system for the Person who forgets to preglow. By having the Glow Plugs on during Starting you increase the chance of the Engine starting, starting faster and not dumping raw Fuel down on top of the Piston.
You can verify it for yourself by looking up the Wiring Diagram or if you have a Turbo Diesel; or,
locate the Junction/Terminal Box in front of the Battery. On the Rigt side of the Pic is a White Wire (that comes up from the starter Solenoid) and the Purple/Voilet wire under it.
Remove the Screw there and touch the Purple/Voilet Wire to any of the 2 Terminals to the left (they have + voltage) and you will here your Glow Plug Relay click on.
You will also note the Purple/Violet Wire at the Glow Plug Relay connection.
Also note that this is the same place a Remote Starter Switch can be hooked up to (the yellow arrows).
On other non-turbo Diesel 123 models the Purple/Violet Wire is connected at the Starter Solenoid.
04-14-2012, 02:10 PM
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