I twisted all wires together, then inserted them in a crimp connector and crimped it. All wires went into one side of the crimp connector. I then soldered the wires in the crimp connector. Then I used heat shrink tubing over the connector. The tubing was about 4 inches long with the crimp in the center. While it was still warm, I closed the open end with a pair of pliers, then folded it back over the crimp connector and put heat shrink tubing over it. That should help seal the open end. Didn't think of liquid tape as mentioned earlier.