interior lights 96 dodge caravan

Don't know if this will help, but I have problems with my interior lights too ('96 Caravan), they flash on & off sometimes, and I have other electrical problems (rear windshield wipers that came on by themselves until I pulled the wire, cruise-control not working, etc.); I think my problem was caused by water draining on the wiring under the dash, let me explain: I live on the Oregon coast where it's very wet, and I'm surrounded by cedar trees, and the needles clog up the drain-holes under my windshield wipers, and the water somehow drains out under my dash, inside my van! Finally, I learned to pull the drain hose under the hood and clean it out (two, left & right, next to the firewall). This stops the leak inside, but I'm afraid that the damage, whatever it is, has been done, there's an intermittent short-circuit somewhere?

Just something to check, Good luck, Ray