If trailer lights are all not working, then it cannot be fuses.
Reason: each light is controlled by different fuses, so blinkers, brake lights, taillights, fog lights, reversing lights: they are all on differently fused circuits.
But the common point is the ground wire(s)
On a 13p plug there are two grounds. Check them for continuity using multimeter.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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