Top corners.The rubber sshrinks a bit over time causing the top left and right corners to pull away allowing water to run inside.
You will probably find the water is coming in and dripping under the parcel shelf holder.
BTW, looking at diagram, it can only really be 3 things if you say it has 12v at the connector.
Earth point under seat, element or feed from the relay onwards.
So nothing in the upper bit.
Lovely.
I'm "guessing" that the steering wheel has been adjusted, as lock to lock is slightly different each side.
It stops with the corner of the boss about 4in different in relation to the shroud.
Thanks guys