[Richard]

Before you drill………hit the clevis with a torch. The idea is to heat the clevis and not the pin. It may expand the hole enough to move the pin. And sometimes a couple of heat and cool cycles will break loose a stuck pin or bolt.

I don’t know how your control system is wired, but now that you have established the relay is not getting a signal to close, here is something quick and easy to check.

Let’s say for purposes of trouble shooting, that the system is sending a “make to ground” signal instead of a “positive” signal. How could you test for that? Hang the ohm meter on terminal 85 and a good ground. If the ohms go to zero when you depress the switch then you have a make to ground signal.

If that is the case, then remove the ground from terminal 86, and jumper from 30 to 86. When the ground makes on 85, the coil will close.

This may be a long shot, but that relay in your pic is something someone added. They did that for a reason, we just don’t know what it was. But I suspect you are trying to solve what someone else tried to solve before you. We just don’t know what they did.