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Alt. got rained on, volt gauge shows low

21seachaser200

New member
New here. Thanks for any help. I had the engine cover off and a hard rain storm came. I waited until the next day and cranked the engine and all was fine. But the gauge on the dash shows about 12.5 volts and not the normal 13v plus. Could the alternator be toast?
I revved the engine but no change of voltage. Both batts. were fully charged.Thnks, Ed
 
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