Everybody loves a happy ending.
Rave showed that the factory-fitted towbar ECU should have been fitted behind the rear left-side trim in the "boot" along with a fuse. I pulled the back of the car apart this afternoon and found.... a DIY arrangement with 6-way relays and buzzers obviously fitted by Scotchloks R Us™
and not the factory. However, got that sorted out and tidied, saw a phat blue power wire heading for the front of car, tracked it to behind the passenger footwell kick panel, where lo and behold, there was a 15A dud fuse waiting to be changed.
So if I'd not made the mistake of not checking first for a permanent live feed before chopping the 12S socket wires, I'd never have found out how to dismantle the interior rear panels (those luggage anchors
) nor would I have known how my towbar wiring had been put together in the car. If you're lucky, you live and learn.
Thanks again for the input. Always appreciated.
Dougie.