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I've had questions like yours many times myself. But those diagrams are direct copies from fold-out summary diagrams in the Volvo wiring "green books". Some of those Volvo diagrams (I have the book for '87-'88) are pink-tinted, which may account for the blotchy reproductions in Bentley.
But AFAIK, not even the Volvo manuals identify the location of the in-line connector symbols shown in the diagrams.
Regarding your question, such a symbol is shown on p390-63 (Grid G-3), in line from the FL switch (128) and then branching to each taillight connector 147/7 (left) and 146/1 (right) for the two foglights (127). But it's Volvo who keeps that common connector's location a secret, not Bentley. If you ever find it, let us know, and that will be one at least.
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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