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If you bought the switch from Lowes, most likely it's the wrong switch. Even if it looks the same on the outside, it could be different on the inside. As for the other wire, push it into the empty slot of the switch & see what happens. There has to be 4 wires in the switch. Black usually goes to L
If your are replacing the fan speed switch on the Hampton Bay San Marino mfg # 67353, this is the correct wiring pattern...L-white, 1-yellow, 2- blue, 3-black. I have been searching for this answer for 2 days. Thought I'd post for others with the same problem.
If this doesn't work you have the wrong switch. It might look the same on the outside but that doesn't mean it's the same on the inside. You might want to check your capacitor to make sure it's not going bad!
You may just have to guess and try it. As long as the L is right, you'll be fine. My guesses, however, would be 1-brown, 2-gray, 3-purple. I don't have a wiring diagram, those are just based on years of wiring. Good luck and have fun experimenting.
I recently replaced my hampton bay fan for the same reason (slow at all speeds) and discovered scorched and melted capacitors and wiring inside the fan. My suggestion is to stop using fan and replace immediately.