Look at the brake light switch down by the rear brake pedal. I'll bet that the switch is extended and turning on the brake light. The switch is adjustable for length. Easy test is to take the spring off of the pedal and see is the light goes off.
Steve in SF
87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project