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Yes, the front fog lights in the later 740s are on violet/white wires (black is ground as usual) which go back to the front fog switch in the dash, all fed by auxiliary relay #127 (as Bill noted), which normally belongs in the front row of the relay tray, second socket from the right.
If they had been red wires they would have been connectors for the optional front headlamp wipers (which were standard on most 760s as I recall).
I can't recall if I've seen the other end of the violet/white wire in a switch connector tied up under the dash, but if it is present it will be in a small 4-pin connector tied to a black/white wire, along with a yellow, white/red and black wire. I suspect for the North American market, the violet/white wire may simply terminate at one of the large connector blocks up to the left under the dash -it's shown on pin 8 in the middle of the smaller half of a large connector block. You should be able to find it there and either tap into it or shove a Molex pin on the other side for a proper connection.
Looking in the FAQ here and as well doing a google search there are a number of articles and threads on E-code conversion, even a few Youtube videos. One good tip I saw suggested busting open the old 9004 headlamp bulbs and soldering the connector end to the E-code connector to make an adapter harness so you don't need to butcher the existing harness. As for the existing relay and wiring being up to the task, although Volvo didn't always over-engineer the spec for their relays, most mention I see is just to use the existing wiring.
After doing a little searching, I haven't come up with an on-line copy of the Volvo service manual wiring diagrams for a 1991 or similar vintage, which is why I went into a little extra detail above using my 1989 manual.
People who have actually done the conversion will hopefully post additional comments here.
I've always been tempted to do the E-code conversion as my headlighting sucks, especially on wet roadways with worn out line painting. The easier thing I really should do is put a better relay right up by the headlights to eliminate a lot of the voltage drop as described by noted lighting expert Daniel Stern (who way back when was an occasional brickboard contributor). If you want to learn everything there is to know about automotive lighting, look up stuff by Daniel; He's not only an expert, he's a real character.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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