The rotary switch for the lights can do funny things.
Looking at the wiring diagram in Haynes it seems the sidelights are on two fuses but split left and right not front and back, the only thing the front sidelights share but not with the rear ones is the earthing point, but that is also shared by other things like the headlights and indicators.
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David
V70 2.5 10v Torslanda Manual 98 Sreg
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