As casell, my dealer fitted my XC90 with the towball and full electrics including permanent live on pin 9. Maybe this was because I gave them a copy of the wiring of 13 pin wiring diagram as when they had fitted a towbar to my mk 1 XC90 they messed it up.
I have also had problems in the past with towing electrics fitted by car dealers so now make a point of giving them the specification I expect them to use.
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MY17 XC90 D5 Power-pulse Inscription, 5 Double Spoke alloys, Luminous Sand, Amber Leather, Linear Walnut Inlays, Winter Pack, Xenium Pack, BLIS, Dark Tinted Windows, Towbar, Mud flaps, PoleStar
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