freightliner headlight issues
 

i have a 2000 freightliner Cascadia daycab. I am having a headlight issues. It started out with no low beam on right side, but brights worked, I replaced bulb did not fix problem, now it has progressed to not having a high beam on that side either which is when I discovered the high beam on both side are not working now. when I discovered the low beam issue I was thinking a bad ground, now with the high beam issue affecting both sides I am not sure how to proceed. Any Advice?