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There is not 0V on the gate, as the gate has no reference to GND.
The only connection to gate is essentially -12V (assuming ideal FET). Hence the ~-12V on the gate :-)
You need to add a reference to GND (e.g. through a resistor) or a dignal path to +12v to change the gate voltage.
In case you...
Altium Library database not updating
Hello,
I am trying to create a library database from an existing integrated library (IntLib), containing 2 SchLibs ("Resistors" and "Capacitors") and 2 PcbLibs ("SMD" and "Leaded").
Now I have created a new database library (DBLib) using the "Tools>Import...
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