High-Power Switching using MOSFETs
The red "wire" that connects from the negative end of the 12V supply and runs horizontally to the drains of the MOSFETs should not be there. The drains of the three MOSFETs should be connected together and to a solenoid, but not to the 12V supply.

If the MOSFETs are rated for a maximum current of 25A I would recommend using at least four in parallel to drive 75A.

There may be many other problems with your circuit but you haven't provided enough information to be any more specific. And please, please, clean up your schematic to reduce the excessive white space.