97 Silverado Turn Signal Problems

Assistance needed on an electrical problem I have a 97 Silverado extended cab w/third door. When I switch on either of my turn signals, they may work for a few seconds and then start flashing faster. I check all bulbs and they are fine. When looking at the lights at the back, they are pretty dim and when the signal is on, both lights flash, sort of like hazard lights, but top/bottom intermittently. Does anyone know what is causing this?

its a problem with your 4 way switch on the steering colum