rear runnning lights

i have a 2009 suzuki m-90 i have had it for 3 months now. i have not been able to ride it for 2 weeks when i did start to ride aging i noticed the rear running lights are not comming on but the turn signals work the front running lights come on but the back ons dont the break light works i toke the bulbs out they do not look bad the front bulbs have two metal spots on the bottom and the back haves one you would think the back running lights would work for safty can some one please tell me if the rear running lights are suppose to come on all the time thank you very much for your help