Range Rover 2004 v8 4.4 no sound when it rains

Hi there,
I have a new problem with my old girl.
During the heaviest rain with the car sat still overnight , i start it up and the radio does not play sound... it operates just no sound ... also there is a behind the dash speaker that clicks to let you know the indicators are working , this stops working as well. A day later it all works fine.
Im assuming that i have a leak somewhere i just cant find it as nothing inside the car is wet.
Can anyone advise me or have had a similar problem?

Water ingress into the left side rear quarter is a well known problem, JLR even issued a fix for the problem consisting of a bit of plastic sheet to divert the water.

Datatek said:

Water ingress into the left side rear quarter is a well known problem, JLR even issued a fix for the problem consisting of a bit of plastic sheet to divert the water.

Click to expand...

With a hole drilled in the floor to evacuate

O Thankyou. ive not seen this before. Do you have any part numbers or references i can look at please?
Im Guessing its under the Amp in the back. I go underneath this and drill a hole?
Many thanks Andy

Andrew RR said:

O Thankyou. ive not seen this before. Do you have any part numbers or references i can look at please?
Im Guessing its under the Amp in the back. I go underneath this and drill a hole?
Many thanks Andy

Click to expand...

A hole in the bottom of the spare wheel well will let the water out but that will not stop it coming in and getting into the amp.