You don't mention the symptoms of failure for your Air Breeze circuit board. Those would help a lot with trying to diagnose the problem with the board.
The PIC MicroController (the 18 legged rectangular chip) is the controller for the IRF2804 MOSFETs used to channel the
current from the rotor on your
wind turbine through an LC (inductor/capacitor) low pass filter to the
brushes.
The gates on the MOSFETs (pin 1 on each) are most likely connect to 3 pins on the MicroController. The sources on the MOSFETS (pin 3 on each) are probably connected together and to one end of the large circular part already identified as a
power inductor. The drains on the MOSFETS (pin 2 on each) are probably connected to the screw posts where the three metal straps are attached. (View the picture with the MicroController shown.) You can check the connections with an ohm-meter. The other end of the inductor probably is connected to the + end of the large capacitor. This is to filter the output voltage and smooth it out. This same side of the inductor should also be connected to one of the
brushes shown on the same side as the MicroController. This would be the +12 Volt out to your battery(s).
The remainder of the
parts are probably used to set up the working
power for the MicroController. I don't know if the PIC16F87/88 is the one actually in the circuit, but if it is, it requires +5 Volts to operate. The +12 Volts would cause damage to it. One of the other
parts (upper left corner of the picture showing the MicroController) looks like a voltage
regulator chip. (I could not see the part number so I can't tell what it is with any certainty.)
Before you begin tearing the circuit board apart, I would recommend you do the following:
1) Verify when hooked up, the ground on the circuit board is actually shorted to ground on your
battery system.
2) Check the "YAWL" assembly on the post and verify it is clean and has no grooves worn into it.
3) Check condition of the brushes to make sure they are in good contact with the "Yawl" assembly. Verify the springs hold them against the "Yawl" assembly, good contact is essential. Poor contact could result in a voltage drop that would prevent
charging the battery(s).
4) Use rubbing alcohol to clean all mechanical contacts; the brushes, the yawl assembly and the rotor.
I checked Digi-Key and found the IRF2804 MOSFETS are $3.19 each. If you order them, get the TO-220AB package. I would suspect the MOSFETs after determining the mechanical parts were OK.
The next item would be the voltage
regulator for the MicroController. I would need more information before I could speculate further.
The Capacitor could be bad, you might try to measure impedance across it. If the meter settles out very fast at a number, the cap is possibly bad. The reading on the meter should be jumping all around if the capacitor was good.
Don't worry about the MicroController. It is programmed with code that controls the MOSFETs which control the voltage being generated. If it is bad, you can just toss the whole circuit board as it is only good for spare parts. I suspect that the manufacturer set the code protect bit so you could not copy the code from it. MicroControlers rarely fail, so I would not suspect it is the problem.
I hope this helps you.
Suddy