I am trying to convert a 3 speed box fan into an air cleaner. I took it apart, and accidentally pulled wires out of their wingnuts, and don't know how to fix them.

I tried my best to draw the diagram of what I have, but let me put it in words as well:

My fan motor has three wires coming out of it: orange, red and grey.
All those of those go to the speed switch.
I also have a CBB61 capacitor with two black wires coming out of it.
Finally, the wall plug itself with a silver wire and a copper wire.

There are three wing nuts, but I have no idea how to reconnect everything together. I'd appreciate any help, and here's the diagram.

enter image description here

  • This question is not the best fit for this site but since you got a reasonable answer we will leave it here and let the community decide if it should be closed or not.
    – Michael Karas
    Oct 27, 2018 at 17:52

1 Answer 1


Do you have a multimeter? Specifically an ohm meter to measure continuity and resistance? Motor wires not necessarily color coded. But we still can find out.

If you have it you may follow these steps:-

  1. Out of 6 wires, see which one is directly linked on metal casing of the motor. This is the protective earth wire. This must go to the ground terminal of the mains plug directly. You should read zero ohm between this wire and motor body.

Now you have 5 wires left to work on. Prepare paper and pen to take note the resistance readings.

  1. Select one wire as reference and measure the resistance of all other wires against it. Tabulate your findings on paper.

After few rounds of measurements, you should be able to see each wires having different resistance which can matched up with wiring diagram such as this below.

enter image description here

Take note higher speed wire having lowest resistance and lowest speed wire having highest resistance. The wire designated for capacitor, its resistance depends on motor horse power. This wire is connected to the condensor coil of the motor.

Your capacitor should have the capacitance marked in microFarads (uF). CBB51 not telling anything. Higher the uF, lower the resistance of the condensor coil.

  • Thanks! I broke down and bought a multimeter (thank you same day shipping) and will do all this tonight. Also, there's no ground in the plug, it's just 2 prongs. The capacitor reads 4 µF ± 5%
    – PBG
    Oct 27, 2018 at 14:12
  • 1
    After way too much trial and error, it turns out that I blew a fuse inside the plug. Live and learn, i guess.
    – PBG
    Oct 28, 2018 at 19:56
  • Usefull video in this link about this problem. m.youtube.com/watch?feature=youtu.be&v=A3kYvNCs75o Oct 29, 2018 at 3:48

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