You have a relay problem in the electrical bay under the nose cap. check all relays.. it is the one in the righthand lower corner.. it's labeled
there is also two 30 amp fuses in the same compartment.. that controls headlights.
I've got the same coach ,BTDT too.
OBTW... all other light fuses are in the 0026 electrical box in the rear compartment., under the inverter/charger. little compartment by the wheel well.
2000 Newmar mountain aire 4081 DP, ISC/350 Allison 6 speed, Wrangler JL toad.