I always keep a couple tubes of 3M or Permatex dielectric grease in my garage and use it for almost all of my electrical connections. It keeps out moisture, prevents oxidation, insulates, and lubricates the sliding parts of the connectors. It also works well on weather strip seals (wipe off excess). Be careful with silicone spray lubes, some of them damage plastic and are intended for metal to metal use.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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