That's the multi function switch - using correct terminology will help us all stay on the same page.
Do you have high beams with the headlight switch on (NOT flash-to-pass, but just plain high beams)?
If not, check the power wire (from the headlight switch to the MF switch). That wire is known for burning, including at the back of the headlight switch connector. If it has an issue, you'll lose low and high beams.
Did you use the correct MF switch? There's a split from early to late aero foxes, like Bill's link shows.
Good luck.