Hi and thanks for using 2CarPros.
In a plug like this, a few things can cause this. First, the pins in the plug corrode and become weak. The result is they can break. Or, the corrosion or a loose or weak connection can cause excessive heat which can result in this type of issue.
What I suggest is to replace the plug and use a dielectric grease on the pins. That will help reduce moisture damage and corrosion. Also, it will help maintain a good connection. You can get dielectric grease at most any parts store.
Let me know if you need help with anything.
Take care,
Joe
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Thursday, February 28th, 2019 AT 8:52 PM