My 940SE headlights only energize one filiment at a time. The low beams go away when high beams are on. I fixed this problem on my Ford pickup by installing a Bright Box that keeps the low beams on when selecting high beams. Has anyone found a way to fix the low beam problem? Does Bright Box make a model for Volvos?

 

Do a google search for Baker Auto Accessories.
You might like to use their contact info to ask if they have a unit that will work for you .
Looks like most of their units are for American cars and trucks but the box should be convertible to fit your needs.
Good luck.