My hydraulic switch went out and caused my light not to work. It on the top of the mc for the rear brake. Bypass it and see if the brake light comes on. Get a baja designs replacement for $18. Could also be as simple as the bulb. not much help on the yellow wire. Take off the tank and see where it goes.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM