I suspect the problem is moisture, which in turn causes the corrosion.
The corrosion is likely not the problem. When moisture gets in the distributor, it tends to condense on the underside of the cap. The moisture is somewhat conductive and starts the process of "carbon tracking", which will short between the terminals causing a missfire, or track to ground stopping it all together.
Be sure everything is in place, some have a dust shield under the cap. If it's missing the cap won't fit properly, water will get in. Check the grommet where the wire goes through the distributor housing.
Also be sure the distributor is protected from rain as best as possible. If it lives outside, you can cover it with a plastic cut off jug, or form a sheetmetal deflector to shed water. And be sure the thermostat is working. Sometimes moisture condenses from the crankcase if there is excess moisture in the oil.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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