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Yessir! It definitely does have an effect. How much of an effect depends on how much corrosion is there. It might be not noticeable, but it will only get worse with time. If I see green stuff, I replace the wires. It's kind of like food - when it doubt, throw it out! :mrgreen:

Bingo. You cannot check an electrical connection by looking at it. Especially not a ground! You must check with a voltmeter or take it apart and clean it. An outside visual inspection is about as trustworthy as a used car salesman's promise. I was going to say a politician's promise...