Black and Yellow wires are L1 and L2 power. The 2 brown wires go to the capacitor. Replace the capacitor when you replace the fan motor.
Your existing fan motor should have 4 wires. 2 brown and or brown and white. They both go to the capacitor.
It should have 2 more wires that go to high voltage Line 1 and Line 2.
Trace those 2 wires and connect the black and yellow where those wires connect.Probably at the contactor T1 and T2.
You could cut them and use wire nuts to the new wires.
If your existing fan motor is not working, it may be just a bad capacitor.
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Not to be too dumb but I guess I am waht are L1 and L2 power and I am replacing the capacitor
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