Welcome to iRV2 and the vintage Newmar family .
I did my own led conversion so I didn't purchase the tubes as replacements .
Did the tubes come with instructions to remove the fluorescent ballast from the fixture .
Not sure if the interior lighting in my coach has separate fuses for different lights , have you checked the 12 volt fuse panel in the bed room ; mine is beside the 120 volt circuit breaker panel .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.