David,
Yes, the "coil" reference threw me off. The Ignition coil terminals are numbered. The 2 blue wires go on #15. The "larger" (maybe a whitish sleeve over a white/red wire?) white goes on #1. I never saw an Orange/Yellow wire anywhere that I can recall. I suggest you remove it for now and tape the end.

Glad to hear you have a meter The 12 volts at #30 sounds good, but I still think you should see that 12v at the other side of the Main relay coil 86/1 until the Key is turned On.

And I'm still confused from Thursday when you said: "The relay that is on the left side when looking down at the relay closes while cranking and stays closed while cranking" The "left side" with the terminals pointing TOWARDS YOU is the FUEL relay, not the Main as I assumed. I wasn't explicit early-on, and we may have gone off track there. if you were instead holding the relay with coils toward you.

Holding the uncovered relay with PC board down and terminals toward you, the FUEL relay is on the Left, MAIN relay is on the right. You might mark them on the PC board. Heres the sequence of what should happen with the Main relay (before cranking):

1) Terminal 30 is hot all the time (from 25 amp fuse). (OK)
2) 12V at 30 should go thru the main relay coil and be present on 86/1 <(are you sure it doesn't?)<
3) The Key is turned on.
4) The ECU grounds main relay 86/1, which should go from 12v to 0v as the coil is energized.
5) The Main relay armature should then actuate and stay closed.

If we can't get thru that list and pick the Main relay, it would seem either the relay or the 86/1 connector contact junction is bad. If it does pick, we can go on to the more common Fuel relay issues. (Yay!)

Does your meter read resistance/continuity? And have an audible indicator for the lowest measuring range? (nice but not essential)

If the Main relay fails to pick, as above, I'd unplug the relay and probe from 86/1 (in the plug) to a good ground. I'd expect a "No Continuity" or "Out of Range" indication, which should then go to "0 ohms" (and/or buzz ) when the Key is turned ON, assuming the ECU behaves as expected. Try this and let me know please.

Bruce
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.