I have a 636 with 3K. The tail light works when I turn on the lights but it doesnt get brighter when I brake. With the lights off it doesnt work at all when I brake. I checked the fuses they are fine. I have no idea what it could be?
Make sure to check the connectors that supply power to the light. I had a problem with my 6rr with the turn signals. Take ohm meter if you have one and make sure you have 12vdc at the the plug if you do it's the light, if you don't it's a power problem and you have a starting point.
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