It’s quite a chore to get to the trailer module - half the interior trim needs to come out!
As I said above, the module had the proper software upgrade when the tow bar was installed last year. And I know I did have power to pin 10 afterwards as I specifically checked whether it came on with just the ignition or whether the engine had to be running. In the event, I discovered it came on with just the ignition so I’m now in the process of fitting a voltage sensitive relay on the trailer to trigger the auxiliary battery charging connection only once the engine is running. I was planning to connect the relay to pin 10 but if I can’t get it working I might just connect it to pin 9. That’s the usual one for battery charging anyway.
But I’ll maybe have a go at stripping out the trim tomorrow to get to the bottom of this. Very odd, and very frustrating.
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Simon J
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