I can't tell you how because I don't have the wiring diagram here at work but somehow the ignition circuit is grounded when the ignition is off. Since the coil in the solenoid is fed by the ignition when the key is on and completes the circuit when you ground the blue wire, the polarity is reversed with the key off and putting power to the blue wire actuates the solenoid.
Best I can explain it........but it works.
Best I can explain it........but it works.



. 
). If you have power above the fuse at the brown wire, then either the fuse is bad or you have a bad connection at the fuseholder. This is where power originates in this circuit, so if you don't have it here, you won't have it anywhere else....
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