I will agree with the Key switch theory, replace or re-locate the switch and you be fine. Some of the newer SW will allow water to flow through it others do not. If re-locating it is not an option then install a new SW which permits water flow through it, you will clearly see the the hole with the key remove and holding up to a light.
I clearly observed this when I removed my old OMC switch and replaced it during my restoration.
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