turn signal and backup lights

I have been having a problem with my right turn signal causing my backup lights to flash, It also happens when I put on my brakes, the backup lights come on, They also doit with the four ways,but not when I use my left signal.The problem seems to come and go. I go thruogh the wiring and get the lights to work and then for no reason the problem will come. Already checked grounds.Any Ideas?