Disco 2 No power to air compressor.

Hi, have gone through every thread I can find but cannot sort my issue, been out and about in lots of rain over the past few months, the warning bell and light for rear suspension would come on intermittently, and I thought it might be the level sensors, so would give them a good spray with electrical contact cleaner, this did the trick now and then, however the rear of the car is now down a bit and after testing the feeds to the compressor I'd got power at the relay, the fuses are ok, but I'm not getting anything at the compressor its self, when I went to check the feed, there was water in the connection, I checked it again today and again there was water, I've tried to follow the feed but it disappears over the fuel tank. Any help would be much appreciated.