Grease won't affect the electrical connection, it will just prevent water from getting in there and making cross connections or affecting the electrical. Use as much as you like. You can purchase bottles of the stuff. It's typically somewhere near the RTV, glue, brake anti-squeal, anti-seize, etc.
You can also use it on battery terminals- inside and out- to prevent corrosion. That's an old trick, except we used to just use whatever grease was on hand. Most grease is non-conductive.
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Originally Posted by the user formerly known as ZX3_Chick
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