If you have the wiring hooked up as described in the previous post, try hooking the tail lamp wire up to the brake lamp. Does it work then? If so the brake switch may be defective. If not then either a bad ground or switch. Trace the wiring from the brake switch to the connectors and unplug it. You will need to test it with an ohmeter and see if it is "turning on and off" as you work the brake. If the switch is working you either have an "open wire" or the brake light bulb ground is not good. Good luck.
Jeff
'00XC250
'04 EC250
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