Electrical problem

[David]

I think it's the joint at the bottom of the 'A' pillar where it goes through the bulkhead. The joint separates and leaks water down to the footwell. Got that, been there, done that!

Nich.

As Nich says, the leak tends to be at the lower end of the tubes, front or rear.
There's a long "How to" thread with loads of photos, again from from Nick, X13#18, on how to fix them:
https://www.two-sixties.co.uk/mgoc26...plete-Solution

David