I've tried 2 different led bulbs that simply replace the halogen bulb. Evidently the ktm ECU doesn't like the low draw of the led bulb and believes a bulbs out. This causes a error message. I might be able to deal with the warning message but the led lamp will not stay on.....it blinks. It's a shame to, as the install was quick, easy and clean. Nice white light, with a lower power draw. It just doesn't work ! If we could plug in the right resistor, maybe that'd do the trick.