San Francisco Volvo Electrical Issue

The lady from San Francisco who had the ancient Volvo with unintentionally automatic rain-detecting wipers, and a slowly dying battery, pretty clearly had water in the electrical box. I'm envisioning 30+ years of salty sea air turning the underside of the fusebox into a turquoise green mass of corrosion. I've seen the combination of water and electricity in a confined space cause ampere-scale leakage, enough to make the battery die within a week. So fix the problem--keep water out of the fusebox!
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