Sounds like you may have shorted something while changing the headlamp......blowing a fuse. Not certain where the headlamp fuse is on your coach.....check behind the panel, on the wall, left side of driver seat. Rook
When you get a chance to dance, or sit this one out......I hope you DANCE!
98 National Tradewinds 7370, powered by a 3126B 300HP CAT Turbo, Freightliner XC chassis