Safety boxes or cables

I bought a Ford Escort 1.6 Bj.96 a few years ago. In the first winter suddenly empty battery because interior lighting did not go out. When pressing spray wiper also went on interior lighting -> just put out all the lights, was then ok. Next winter was quiet. In warm and especially dry weather anyway always ok. Now again massive problems. Since at the same time also puddle was on floor mat, I thought about connection. (Windscreen leaks, runs over fuses box, forming shorts, dripping on mat). According to Ford two things. Footroom was sealed > no more puddles. Constantly empty battery, because in case of rain (nights) light on, although switches off all. Ford says card in the fuse box is cracked(??), fuse box must be new. My fear now that it could not lie on the fuse box, but on supply lines. Currently I help myself by always pulling out the fuses for dipped + main light for parking. Always only front. Who knows about the wires and circuits? If it’s really on the fuse box, I’ll get one.