1956 f100

I am nearing completion of a restoration of a 1956 F100. It has a 1973 429 CID with C6 Transmission. It also has a 1979 Cutlass steering column hooked to a rack and pinion on a Mustang 2 IFS. I am hooking up the lights at this point. I have the flasher hooked to the power input into the column. the left turn flashes, but the right will not. It lights but won't flash. Any ideas form anybody out there?