Sci.Electronics.Repair FAQ: Notes on the Troubleshooting and Repair of Small Household Appliances and Power Tools
Note section 14.12
There will likely be a common, high, low, medium
And two leads for a capacitor
Two of the colors will likely have zero ohms. One will go to the external capacitor.
The trouble will be, identifying the other side of the cap and the speed windings. But the cap winding should be identifyable with the resistance matrix.
If you can post that, then we ought to be able to determine the color code. Using a lamp in series will prevent damage when doing the final test.