I dont have towing equipment, but used that supply for a cargo area 12v socket.
My car is a MY17 and has 1 connection box. It is as shown on the wiring diagrams labeled as 'supplementary' (or something similar!) available on the Volvo site.
The fuse is shown as FA9 and is already wired to a connector in a little foam bag hanging below the access door.
Hope thats a help, but beware, other sections were found to be correct, but with reversed wiring colours, perhaps as left hand drive!
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