Hi, on my my back from holiday yesterday, I hooked up the trailer and noticed that the courtesy lights no longer work, even if t I turn the map lights or any lights on, nothing, also my dashboard is at its lowest brightness setting, only able to read the infotainment system and dash in near darkness. I’ve gone into the vehicle settings and changed it to 100% but it made no difference. The trailer is packed away for another year but still no lights inside, I’ve also tried a reset by disconnecting the battery but still no lights, any ideas where to try next?

Could a fuse have gone?