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This quick video shows one method to connect 2 wires together. I made a full masterclass on creating a wire harness earlier this week:
Which method do you like better, and why?
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This is a quick how-to to make a self-soldering butt splice, i'm going to show you a really quick and easy way to connect two wires together, we're going to strip the ends of these and we're going to fan out just the wires a little bit so that We can make a mechanical connection between them before we add our special connector that i'm going to add next, so i stripped them and i'm just twisting to get a nice tight little connection there and now that i have that in place. I'm going to take one of these connectors that has solder right in the middle of it, as well as the heat shrink to keep it nice and water tight. I'm just going to slide it down right over that connection that i made and now we're going to hit it with the heat gun and we're going to look at how that actually bonds with the wires under the microscope. I'm going to situate this guy right here, clamp it down, so it can't move and there we can see our solder right in the middle of those wires.

Now, for this i'm going to use this heat adjustable, porter cable heat gun - i can make it a little less intense, but i'm going to go full hot. We are going to solder this connection down right now by giving it some heat now truth be told. I've used these things a few times, and i wasn't doing that mechanical twist and the results were not nearly as good as this was okay. Now we're going to check our connection, make sure that it is nice and strong that that solder has gone between all the strands of wire there, and it has indeed it is a nice strong connection all because of this little connector.

Now, just like everything else, i just show you my experience and i've done a couple of these now with that little mechanical twist, it's worked out a lot better. Let me know if you've used these things before and how they worked out for you.

By Chris

9 thoughts on “Self soldering butt splice heat shrink connectors”
  1. Avataaar/Circle Created with python_avatars Eli Caceres says:

    love what you do I was wondering if you could teach os how to clear some Subaru wrx 2015+

  2. Avataaar/Circle Created with python_avatars Gary Jon Meyer II says:

    I’m thrilled that they’ve revised the composition of the self solder heat shrink connectors. 20 ish years ago when I discovered them the heat gun would blow through the heat shrink exposing the solder before it would even have a chance to melt. I’m using the twist on connections that it’s possible. Have you found a solution if you had to splice in and lengthen a wiring harness?

  3. Avataaar/Circle Created with python_avatars Choaski says:

    These do NOT give proper flow through of solder. The connection is around the cables, not throughout, resulting in a poor connection compared to using a soldering iron

  4. Avataaar/Circle Created with python_avatars Kenny Man says:

    I bought some of those butt connector with solder from vled to have when I do some diy wiring.

  5. Avataaar/Circle Created with python_avatars Terran Eligon says:

    That's why I'm grateful for this lil invention. That and the solder paste in the syringe. Remember I told you that my last experience with a soldering iron, I inadvertently held it as if it was a pen. Despite the complaints people have made about these connectors, I have never found any fault and never a need to revisit the connection if something doesn't seem right. What you did is the right way and the same way I use them. NOT. A. SINGLE. FAILURE.

  6. Avataaar/Circle Created with python_avatars How to Automotive says:

    You should drop an affiliate link in the description for those connectors. I’ll click and buy

  7. Avataaar/Circle Created with python_avatars Ariyana Dumon says:

    Always do the twist man. I even put a bit of flux on the twist, slide on the connector and a piece of extra heat shrink. Get the initial connection down and strong, then make it prettier with the extra heat shrink. Done.
    These are great, just gotta learn their language I guess lol.

  8. Avataaar/Circle Created with python_avatars Shae Jelinek says:

    Next time I use them I will put that twist in. When I used them before they didn't work well. Thanks for the tip!

  9. Avataaar/Circle Created with python_avatars Chris Mezzarobba says:

    Absolutely love them

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