My Rear right hand turn signal (on my suburban)works fine with the lights off however with the lights on, it blinks fast at the front and rear. I noticed that the top tail light doesn't light up when the lights are one while the left side both top and bottom light up. I took the working light assembly off my 95 sierra and tried it on the suburban and got the same results. This tells me that it is in the pigtail/plug somewhere. I am thinking of clipping it and splicing in a new one but not sure if there is a way to trace the tail light pigtail.