I just did this yesterday as well and had no trouble. Used the 330 ohm, 1/2 watt resistors from Radio Shack.
Check the following with your install:
- Make sure you've bridged the correct two wires with the resistor. See the picture below (which I got off VFRD). Basically you need to bridge the two leads that are opposite the locking tab thingy
- Make sure that your resisor legs are making good contact in the terminals of the connector. When I did my wife's bike yesterday I found that there's some space behind the terminal that's easy to push into (but won't give a good connection at all -- I labeled this "Not Here" in the picture) and then space between the blades of the terminal that does give a good connection (I labeled "Here" in the picture.
- I also doubled the legs over on the resistors to make them wider to make sure they contacted the terminal inside the plug. The terminal has the typical female blade terminal shape and therefore a round wire stuck into may not make good contact. See the small resistor graphic I drew below for an idea of how I bent my resistor legs.
Hope this helps.