A wire may be cut from the brakes. the turn signal wire is still connected
change the fuse if not replace flasher
the ground for the rear lights is by the radio aerial inside the rear passanger side wing.
Check socket for corrosion-and make sure it is grounded
Rear loom ground not contacting. Bulbs burned out or missing. Brake light switch or connection to it is fubared.
must have 2 head lights-2 brake lights-2tail lights-and front and rear signals
Bikes use signals and lights for communication and safety. Common types include hand signals for turning, brake lights for stopping, and front and rear lights for visibility.
blown fuse or turn switch bad
The only thing common to all those lights (but not to the center brake light) is the hazard switch. I'd check that next. On my 96 Century the hazards override the signals and brake lights meaning that the signals and brake lights must be wired into the hazard switch somehow.
check for a loose ground wire
it would be the brake light switch about 20 dollars at autozone
If the center one works then it will almost certainly be 2 Blown globes.
The multifunction switch inside the steering column is bad.