Ok the battery light is a misnomer. it's the alternator light for what it means is the alternator has stopped charging.
Now a question.. What was the wetter like. (That's a pun on weather) Dry or well. Wetter? I have not had this happen on my Workhorse.
But several cars. Including the one I drive know will stop charging and turn on the light if I hit a puddle of rain or melted snow and soak the alternator.. Soon as it dries out .. Light out voltage up.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times