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I do not have the correct manual for your car but these are about later model Glow Plug Systems.
Also on the 123 Glow Plug Systems when you are cranking your starter you Glow Plug Relay is avctivated bay way of another circuit and a wire coming up from Starter Solenoid.
In the comments on how the Relay worked normal it said that the duration of the preglow is decided by the Temp Sensor inside of the relay or a Coolant Temp Sensor.
So on most 123 the temp sensor is in the relay and would determine the preglow cycle; but when I turn the key and start Cranking the Starter the preglow relay is activeted again (manually).
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84 300D, 82 Volvo 244Gl Diesel
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