that is, I have to understand that T is taken from the glow plugs and their temperature controls the transistor, which turns on the relay and turns it off after reaching the set temperature. and 85 is some kind of bypass (bypass)?
what's up with 85? Because the drawing shows that the relay can be controlled by the electronic system, or by giving 12V to 85. Where can 85 come from?
In the diagram, you have 85 and 86, one input will be the gnd mass and the second plus after ignition, I just don't remember which plus and which minus.
The discussion revolves around identifying the terminals L, T, 50, and 85 on a glow plug relay for a Golf III 1.9 D. Terminal L is designated for a control lamp, T is connected to the temperature sensor, 50 serves as the starter activation signal, and 85 is associated with the relay coil. It is clarified that the T signal activates the relay when the engine is cold, while 85 can be controlled by the electronic system or by applying 12V. The inputs for terminals 85 and 86 include a ground connection and a positive voltage after ignition, although the specific assignments of plus and minus were not recalled. Summary generated by the language model.
I have a relay like in the photo 
