I got the alternator wet with water, while changing my thermostat. The car started up fine after I did the thermostat work, but today (2 days after) the battery seemed dead. Could it be because the alternator got wet?

the car is a '69 280S W108

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'77 300D 387,000 Miles . . .

'69 280S (SOLD)

'79 300CD (SOLD)