Scrape off dirt and corrosion in the contact holes with an ice pick, rat-tail file or small piece of sandpaper rolled around a toothpick Then, dab a little grease on the prongs, push the connector together.
A little petroleum jelly or light waterproof grease spread on the surfaces will act as a barrier against air and moisture, retard oxidation and keep the lights operating longer.
Soldering all wire splices will help prevent problems with loose connections. Wrapping the splices tightly with electrical tape or heat-shrink tubing will seal out dirt and eliminate shorts.
To keep dirt from getting into the plug between uses slip a small plastic bag over the plug and secure it with a rubber band or tape.
