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I checked the items as you described.
A) The Terminal 30 is hot all the time (from the 25 amp fuse).
B) 12V is available at #30 and is present on 86/1 terminal. 12 volts go through the relay and are present at 86/1.
C) The Key is turned on. The 86/1 terminal goes from 12v to 0v as you described the coil is energized.
D) The Main relay actuates and stays closed.
That's good, but a bit confusing because on Mon Oct 11 02:33 EST 2004 you said. "when I probed 86/1 terminal at the connector I get no voltage". These conflicting results make for slow going. I have to keep retracing the thread to recall what is and what isn't.
Also, I should have suggested the final step—making sure that voltage is available on 87/1, the Output terminal. (the armature could be closing, but provide no output due to bad contacts)
At least we now know the Main Relay works properly, as controlled by the ECU, and which one it is for sure. The next part, however..."I then went on to check for resistance, I unplugged the relay and probed the 86/1 connector ."....is irrelevant I'm afraid , and thus confusing you, because I suggested that business only if the Main relay failed to pick (see my last post). And you proved that it does pick properly.
But it did show that I was wrong in thinking you would get those ECU responses on the "open" 86/1 wire. I don't know much about electronics , but suspect that the ECU circuit can't be tested "open loop", so to speak, and probably needs the load of the relay coil to respond like I though it would.
Please try the same test on the Fuel Relay, as follows:
A) 12V at terminal 85 with Key On, and reading thru coil to 86/2
B) 86/2 loses 12V when grounded by ECU during engine cranking.
C) If A + B, then 12V should be present at Output terminal 87/2 while cranking
D) If C, then 12V should be present at Fuse 4 (left contact) and pumps should run
Let us know how this test goes, but I'm still thinking about the harness replacement, and that "Orange/Yellow" Coil wire you mentioned on last week. Was that part of the new harness? Or maybe an overlooked ground connection. Did you tape it off for now as I suggested? It's not "stock".
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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