Rep Power: 0

I have a 98 civic aerodeck and it has recently started to show problems with the lights, when the engine is on and the side and headlights are on the brake lights are flickering erratically, also when engine is running but no lights on when the brake pedal is depressed the dash lights and side lights are flickering on and off. When the ignition is off the 'lights on' warning sound is beeping, this is all happening intermittently. I have been having problems with the car taking in water mainly in the boot area and also the front passenger footwell. I have removed all the interior trim at the rear of the car and have noticed the two main electrical feeds to the lights are wet, i have checked the light clusters and bulbs both are dry, i have also checked the earth at the rear, any help or advice very gratefully received please!!!