If all fuses are good, I need you to check for power at the light socket. If there is none, we need to work backwards to see where power lost.
Here is a link you may find helpful:
Also, let me know if the vehicle is on a GM chassis. For example, is the RV built on a GM express van chassis.
Take care and let me know.
Wednesday, June 16th, 2021 AT 10:21 PM