"Volvo's multiline wiring diagrams do not show a fused sided wire coming out of the fuse panel to the ICU, but do show on the ignition diagram at N3 that power comes from 10sub11. 10 is the fuse panel."

• Agreed, Duane—except that the (later or model specific) diagram at N3 actually says "10/11IN", which I took to mean INput or "feed side". That's exactly where the older Bosch ICU got it's power, as shown in the earlier diagram in the front. And it would make sense, for wiring harness consistency between models, to use similar circuits where possible.

"So their diagrams both appear to connect and not connect fuse 11 to the ignition."
• Not if you see the earlier (C&D column) diagram as showing the Bosch ignition being "not connected" to fuse 11, but to the input side. And the newer V/C ICU on N3 also being "not connected" to fuse 11 (output), by virtue of the 10/11IN off-page identifier.

I tend to put more faith in the "multiline" diagrams (good term), having often found errors in the Green Book service manuals, as well as fuse panel labeling. I believe those things are written by tech writers early in the game and apparently never updated. Such as the "Fuse 6 - Main Fuel pump" label on LH2.2 cars, when it's not true for U.S. market 240s until 1991.

But this may be the time when the detailed diagrams are wrong, and the high level stuff is right. In any case, it's hard to argue with your closing comment:

"Now in this case it may not be as obvious as a blown fuse, but to me when one shifts into OD and the car dies, something somewhere is related."
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.