I will check out harbor freight, it working again, I just cleaned it with a paper towel and it worked, I'm using it for tonight LOL
Try using a tiny amount of nolox or dielectric grease on the contacts to keep them clean and corrosion free. Be very sparring with the nolox as that stuff will get all over everything.
The dielectric grease you can get from auto parts store. It is used for spark plug wires.