I have a 67 RS/SS and the right directionals fail to blink on and off however they do light up. The left blinkers work fine and when the hazard button is set all four lights work and blink as they are supposed to. I have checked and replaced the bulbs on the right side. I have replaced the flasher under the dash near the steering column. What else might be wrong? Grounding issue? If so how can I verify? Are there 2 flashers - one for each side? Please don't tell me I have to take apart my steering column and replace the blinker switch. Thanks in advance.