Quote:
Originally Posted by Diesel911
There is a purple/Voilet wire that goes from the Glow Plug Relay to your Starting Circuit. So, your Glow Plugs are actually on during cranking.
One of the reasons that Starting Fluid should not be used as the Glow Plugs will ignite it early on.
On the Turbo Models you can see a White and Purple wire on the Terminal box. The White Wire comes up from the Starter Solenoid and gets Voltage when the Engine is Cranking; that gives the Purple Wire Voltage and activates your Glow Plug Relay.
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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?