mosfet trouble

I wonder if you guys might be willing to take a look at this simple schematic and tell me if it should work. This is modified from a schematic DrAzzy wrote. The difference is, this one uses a single 12V power supply for four 12V cooling fans. The schematic DrAzzy wrote uses a single 24V power supply for each individual mosfet and one 24V pump. Here’s the mosfet

The 12V 2A power supply reads 12.24V but when it’s connected to this circuit, the voltage floats around between 0.16 and 0.79. That’s without fans or Arduino connected.

EDIT OH geez…I just realized I installed The diodes backwards…Sorry about that.

mosfet.pdf (340 KB)