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Don't forget, that continuity with a volt meter doesn't always mean you have a good connection. I've had plenty of times where the meter reads zero ohms, but when you attempt to pull some actual current through it, it doesn't work.
As far as cleaning terminals, I found something which works much better than trying to use a file or emery cloth. Using a Dremel tool with a stainless steel brush does a fantastic job. It cleans the surface to almost to a polish and doesn't create deep scratches into the metal. Most times it is just as easy to reach the contacts as it is with my fingers, sometimes even easier.
As far as cleaning terminals, I found something which works much better than trying to use a file or emery cloth. Using a Dremel tool with a stainless steel brush does a fantastic job. It cleans the surface to almost to a polish and doesn't create deep scratches into the metal. Most times it is just as easy to reach the contacts as it is with my fingers, sometimes even easier.
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