How to fix whole separation in cowling which is causing electrical system issues

What is your question?

After car wash stereo started going out then back when dry. Now seatbelt chime, door chime, blowing spark plugs over and over. When we have dry weather which is rare right now(new Orleans)everything seems to work fine. Changed bad battery but noticed gaping whole where seal on bottom of windshield is. Seems to be running alright except for a little rough compared to it's old smooth idling .It smells as if it rained in car but no evidence of wet floor. Could this be reason for things scrapping out? And do I need reset code after I fix or replace weather stripping? Thanks in advance