sounds crazy for sure
when i had my little water incident

mine had some crazy stuff goin on when i got water in wire harness connectors. disconnected the one in the engine compartment above the brake booster. used a small brush and a can of spray air to clean it out and reconnected. did the same to two connections at the drivers foot. they are just behind the panel that has the hood latch to the left of your feet.
i would definitely make sure everything is good with the fuse box or anything else that has been modified. reseating connectors work wonders. ive noticed in aircraft maintenance that a lot of times problems are caused by previous maintenance or modifications.