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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.
hey how are you
if the key ignition cylinder is defective mechanical it can turn back on acc, so you will to replace the ignition cylinder ,if that is what you meant buy the comment on switch turn back on
now as far brake light broke and water get in that will cause a short intermittent
go to the brake light fuse and measure with key off & test that circuit like below procedure let see if any circuit is staying on with key off
Battery Drainage Test
1- Voltmeter2- settings on voltmeter will be on milli amps.3- go across all the fuses in the car and see which one is reading higher than 0.3 to 0.5 milli amps4- the fuse drawing more than 0.5 miili amps ,will be the suspected circuit that needs inspection for the drainage.
Please let me know
ASE Certified Technician