Directional problems on my 78 cb 750
 

I have two 1978 cb 750's and the directionals don't work correctly, I have replaced one of the switches and switched the flashers, but the irregularity continues. I have completely disassembled one of the bikes and rebuilt it and the problem continues to bug me. I'm sure it is something simple, perhaps some of you have dealt with this problem please Help!:cool: