Just did a brake wiring repair on my 99 Honda Roadsmith trike. Went on a run with some friends and they informed me my left lower brake light wasn't working. To my surprise when I was changing the bulb I discovered that the zip tie holding the wires had snapped and the wires dropped on to the tire. The tire ate through the wires severing them thus no brake light.
You might want to consider putting a additional zip tie through where the existing one is to prevent this from happening to you. It's easy and could save you a major headache not having to repair the wiring harness.