Ray the problem you are having is that the relay isn't getting the signal to energize the circuit for the "control side" of the relay. I would install the old box for the following voltage tests.
Make sure you have a good ground for the tests or the results will be "bad".
Looking at the starting circuit diagram, connector C270H, red/ Lt blue wire #11 - check for power when the ignition switch is turned to "start".
I use a sewing needle with the plastic ball on the end that I insert into the connector from the back. They usually make contact with the pin / blade and allow you to probe with the meter without damaging the wire insulation.
All connectors need to be plugged into the sjb in order to power the circuits.
If you have power there, check for power on pin 3 of C270A, tan/red with the ignition turned to "start" like above.
If you have power at this point check pin 1 of C270A, Dk Blue / Orange wire, again in "start".
Power at all three places means PCM is not providing a ground. Check ground points in the engine bay and the kick panels in the cabin.
Losing power at any point means that the failure is before where you measured.
In a sense this is just like the old style of Christmas lights that were wired in series. One goes out and the entire string is dead. When you're testing there will be power at some point down the line, hit the bad one and there isn't power from that point on. Same thing with the starting circuit.
