This isn't the ones I mean but maybe something like this would work.

Thanks John. I had tried google a bunch but I went back there after I posted the above and now I found some good ideas. 

One idea I had from looking at kits on Amazon is to buy some pure copper tubing (not brake lines that are copper steel), slit a piece of it to slide over the existing wire where I strip off the insulation, poke the end of the one I'm splicing in into the piece of tubing, crimp it, solder it and then wrap it either with heat shrink or that really heavy stick tape that GM uses. 

StriperSS wrote:

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They have T-Tap connectors, but they partially sever the wire you're connecting to. Heat shrink will only work if you can slide it over from the end.

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 Yes, it will depend on the size of terminal that is already on the end of the wire I'm tapping into. 

I don't like those T-taps very much, trying to avoid those. 

I was reading some Amazon reviews. This was one of the comments. Why would he buy a kit full of crimp tubes?  What was he expecting, pre-crimped connections that he didn't have to do anything to do before using???!!! LOL

"You need to cut and strip the wires and insert both wires and crimp. Hard to use, not recommended."

Picture doing this with 12 gauge wire. I've done lots like this with smaller wire but on a 12 gauge it's going to get very bulky. 

I want to do this in each door. I need power to the switch for my power door locks as well as for the power vent windows. The power window switch already has live to it on each door, so I want to tap into that wire and run that to the lock switch, then the vent switch. I think that is far better than having 3 separate power wires running all the way from inside the car out to each door when I can do it with one power wire that branches out. 

I was thinking this was what you were looking at doing.If you use a good heat shrink the size of the 2 wires together, it will cover the 2 wires and slide over the single wire and shrink down tight. If you open up the ends of the wires so the individual wires and slide these strands forward into each other, 2 on one side, one on the other, you should be able to get a smallish solid solder joint where they meet? The marine heat shrinks are thicker and have additional glue in them. Ive also covered the crack of the double wire joint with liquid wire coat, then after that dries, put the heat shrink over the whole joint. The liquid cost will seal that joint from moisture. Ive done these sort of joints on my boat.

whiskeydog wrote:

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phillipsind.com/product/multiple-wire-connectors/

We use these on occasion in the heavy truck industry

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 Tony, do you strip the wire that goes all the way through, strip the end of the one you're adding, push it into the sleeve then heat it? Or do you have to twist the wire being added around the one that goes all the way through, then heat it? That does look quite neat and compact but I'm guessing the picture is much smaller wires than 12 gauge.

With that Grote #, it should be available in Canada at Napa, maybe CTC.

Carl... Maybe check here in the USA before you go home to buy it. I got caught using a Dorman number I found on Amazon, thinking I could buy it in Ontario. Some numbers ONLY available in the USA.....

I've been watching this post to see the different suggestions. To make a splice look like the Carl posted with the black wire joining the existing red wire with white tape, do this:

1. Remove 3/4" or so of the insulation from the red wire,
2. Remove 3/4" or so of the insulation from the black wire,
3. Where the red & black wire meet, trim the insulation back at an angle of each of the red & black wires, basically allow them to merge together.
4. Hold the conductors side by side, and solder them together.
5. Apply tape to cover the joint.

I split the single in two and fitted one of each of the other wires into each side, load that joint up with wire, its plenty solid.

whiskeydog wrote:

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Something like this is likely more what you are looking for and surely you could get a vendor in your town to order for you if you cannot get to the city. This link should take you the product line to find what size you need.
greggdistributors.ca/electrical/Wire-Connectors/tec761724pk

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 Exactly what I'm looking for, thank you!

They aren't in Manitoba but I have relatives in Alberta so I'll see if I can arrange something. 

The only issue is, it doesn't show me the price and I don't need a pack of 25 which it appears is all they will sell.

Anyway, thanks again, I'll see what I can do with this.