I have a 1993 Silverado K1500. All blinkers work except the right rear turn signal. I replaced the bulb in it and it will only flash when I have the left turn signals on. I tried to replace the connector plate with the same results. I attempted to splice in a right aftermarket signal amd couldn't get any power sent to it. Only worked with the left on again. I can't seem to trace down any of the culprits and wondered if anyone had any suggestions ? The right front bulb is working properly