turn signal problem.

[JRracing]

My father and I built a 68 sbss and put led turn signals up front and a set of led tail lights out back.
The problem is we can not get the turn signals to flash. It lights up and stays on in front and back, but no flash. but the 4 ways flash when activated.
We have tail lights and brake lights and hazards working. Just no flashing turn signal.

Here is what we tried, new led flashers, switched with the 4 ways, new turn signal switch in colum, checked ground at rear, checked fuse its good.

Anyone have any other idea's?

Thanks