As an off the top of my head answer, it would seem that water is getting into the radiator or onto the exhaust and condensing on the ignition system, causing it to ground out, Try spraying all the exhaust components that your can see that are likely ot be affected with a water repellent spray. Seal your plug leads at the plug and distributor head with a small smear of silicone sealant. Also check the inside of your distributor cap for moisture build up and spray that as well.
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