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A short will be the hardest thing for us to help you find. But with the presence of water , that is a great place to start. Follow the water and look for corroded wiring , if you disconnect all the brake lights and the third light and it still blows then the issue is limited to the body wiring from the switch to the modules under the dash and also from the module to the light assemblies. Hope this information helps. Lou. Also if I find any common issue I will return and let you know. Lou