Both brown wires from the fan motor should go to the 5 mfd cap.The red wire from the fan could go to the common on the 40 mfd cap.The other wires from the fan motor would go to the speed control.I am sure RM will correct me.
You could remove the orange (lo speed) and blue (med speed) wires and put them where they wont short against anything and run it on high. If it speeds up then it probably is a bad switch. Jimbo is right the motor has a red wire for common(weird) and mounts on the dummy post of the fan switch along with L2.
His explanation led me to believe he was using 2 caps not a dual cap.He said he changed out the 5 mfd 3 times.He also said he has 2 brown wires, which normally would be power in power out for a single cap.And yes the red(com) wire would go to L2.I could not find a diagram myself. Just giving info from logic of most systems.I am with JW...send me a picture of this weirdo.
Perhaps you would like to read my award winning "how to check a window unit fan switch"http://sites.google.com/site/sublimeappliancerepair/ask-the-sublime-one-a-question/charging-a-window-air-conditioning-unit/window-air-conditioner-woes/checking-a-window-unit-fan-switch
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