Upon further reflection:
The towing wiring on my daughter’s XC70 is not Volvo but is a dedicated system supplied by a tow bar fitting specialist firm.
In addition to the connection into the load area fuse box there are two plug in connections to two plugs which are part of the car’s own wiring system and are located under the load area floor adjacent to the nearside wheel arch. The system also included two modules, one of which is a twin relay. I’ll try to provide more better information as soon as I can.
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Ian.
Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.
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