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Do you have a multimeter? Measure the coil resistance in both directions, use the higher resistance for polarity. If you get 400 ohms with the red lead on terminal 1, that will be the terminal the black pink wire goes to. I have the same Trombetta solenoid in mine, I can measure if this is...

Small terminal closest to the labeled Bat input terminal should be connected to the black-pink wire. Other small terminal goes to the blue wire. Naturally, large terminal labeled Bat will connect to the resistor bank other large terminal goes to orange glow plug wires and the thinner orange...

This polarity warning applies to all solenoids, marked or not. How do you know if there is a protection diode? Markings are there easy clue. But some aren't marked, testing with a multimeter is the only way to be sure. The diode symbol should be in the circuit diagram but it isn't in the...

Yes, it matters on some solenoids. Some may have a diode in parallel to the coil to snub back voltage generated when the solenoid disengages. The magnet field collapsing causes a sharp reverse current which arcs switch contacts and lets magic smoke out of transistors. If labeled BAT, it...