TR6 Electrical woes

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The TR6 got drenched on the outing this past Sunday, bonnet was up when 
it started, but I got it closed quickly.  After the downpour, it started up
fine,
headlights would not come on, running lights would not go off, the brake light
that has never come on kept lighting up as we drove.

Anyone with a suggestion as to where to start to find the "short", "ground",
or "wet" connection?

Any help is appreciated.

Thank You

Walt
73 TR6