The IRFZ44 is fully turned on,This is a manfactured circuit board. I have one hooked up and flashing 12 volt LEDs .I do not care what the specs say it works.The datasheet for your IRFZ44 says that it is fully turned on when its Vgs is 10V. The output of your PIC is only 5V when some IRFZ44 Mosfets barely turn on.
You should use a logic-level Mosfet like an IRLZ44 (see the L?) that turns on well with a Vgs of 4V or 5V.
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by Jake Hertz