Turn Signal Issues 63 Valiant

You have found the "area of" the problem, so double check:

With BOTH the column / switch connector disconnected, and the bulkhead front harness disconnected, verify

the fact that you said earlier: That you have power on the green/ ??? that is left/ right signal wires feeding out of the bulkhead

THAT POWER should not be there.

If it is, you need to find out where it's coming from. It's either a problem in the under--dash harness, or a problem in the cluster.

With the above described situation, you SHOULD have two dead ended conductors, and the dead ended indicator lamps

So you have two identical circuits, left and right, and both consist of:

A wire dead -- ended at the disconnected signal switch on one end.-------------and on the other end the wire is dead -- ended at the bulkhead connector

Somewhere in that wire, a branch (Y) runs a wire up to the hot contact of the indicator socket, which is grounded.

So there is only two ways for that circuit to become powered, if conditions are as you describe:

As I mentioned, either a fused/ crossed condition in the harness, or the indicator sockets are somehow "un" grounded and receiving power from another circuit in the cluster

I'm betting on the cluster.

I'm not familiar with these early clusters. If you can round up a good clear photo of the rear of one and post it, might be able to give you some ideas.