Solder sleeves are our preferred method of joining multiple wires inside a harness. Similar to all of the electrical connections in any of your vehicles control modules, soldering provides a good electrical connection. The heat shrink sleeve and measured amount of solder in each sleeve prevent the problem of solder winking up a wire causing a brittle failure. Complete the joining, strain relieving and sealing in one step with your hot air gun.
We don't recommend using these with the low temperature vinyl insulation found on generic wire. Sold in boxes of 100.
Check out our How-To Guide on Solder Sleeves for a few tips and tricks.