Water in Battery Compartment

[talljames]

So, I had a couple of heavy rain days and ended up with water in the battery compartment again which took out my suspension level control module and radio module. I have clean drains for the sunroof and recently cleaned out the plugs on the drop down tailgate. I checked the wire rubber loom cover that runs from the tailgate to inside the car and that is all ok. I have read that it could be due to tailgate light seals. I assume these are the inner ones that people are talking about. Will need to investigate further but if anyone has knowlege of this it would be appreciated. I am thinking of drilling holes in the floor under the battery and using grommets (i am not going to be driving through wheel high water levels). But a bit cautious on doing this.

cheers