this would figure if there was a point of high resistance in the circuit , is it later than 2000 ? If so look at the CEM above your right knee , see if there are wiring modifications with poor crimp connectors ... if so remove the additional wiring and solder the original wires back together , This was a mod by volvo some time ago to reduce the voltage to the headlamp bulb to increase its life , it was a piece of resistance wire that got warm and can play up at the crimp connectors .. best get rid of it !
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 My comments are only based on my opinions and vast experience .
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