Quote:
Originally Posted by micalk
The relay is the most likely source. The relay applies 12V to the light.
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Quote:
Originally Posted by tangofox007
The relay only powers the glow plugs. If the relay also powered the indicator lamp, the lamp would remain illuminated for the duration of the glow cycle.
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If you want to play semantics here, fine. The schematics call the entire assembly a "Glow Plug Control Relay". You can say that the "relay" doesn't control the light, but that light is turned on by the assembly. And like I said, MB calls the assembly a relay. And why not let everybody know what
is applicable instead of saying what isn't. Gasoline isn't applicable here either but saying so doesn't help anybody.
Digi-
If you feel adventurous, disassemble the 4-pin connector and pull socket #3 out of the connector. If the light still comes on, the problem is probably in the dash. You need the other three connections for the relay assembly to operate properly. Since two relay assemblies are displaying the same symptoms, doubt that it's the relay.
The temp sensor is built into the relay for your model, so there isn't a connection for temperature to the engine. I think its only function is to determine how long to illuminate the dash light. There are other temp sensors in the head - temp guage and climate control lockout come to mind immediately - but neither has anything to do with the GPs.