I attempted to check the available voltage at the rear cargo space 110V outlet and all IO got was a red LED and no power. Does anyone know where the fuse is for those or if it has a relay? The owners manual has no pictogram of the fuse layout but does have a numerical guide and none shows the rear mains outlet fuse. Thanks for any help on this.

Found the answer not in the Defender manual or on line but in the 2018 Range Rover guide. The power socket is protected by a circuit breaker and not a fuse, and after a fault, the breaker will reset after awhile. The red LED shows there us a fault such as an overload or short circuit and the amber LED shows power is being supplied to the plugged in device. Also, do NOT plug in a circuit checker or tester as this will trip the breaker. Many testers check not only for the hot leg, but also for the neutral and earth ground, and in a vehicle the neutral is actually the ground as well.

Hope this is helpful to others.

https://www.ownerinfo.landrover.com/.../proc/G2167641