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All Volvo options are prewired.
With the foglights, you need a relay and the OEM switch. You may also need to connect the terminal of a jumper wire that determines US, EUR or JAP modes of operation (though some 850 owners have found this wire to already be connected).
Foglights in US/Canadian Volvos only work when the headlights are on. I used n0v8or's wiring diagram to defeat this scheme - I can turn the foglights on whenever I want, and they go off with the ignition; so now I use the foglights as DRL's. (Better to burn up a $4 H1 lamp than a $20 VisionPlus H7.)
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)
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