do i need a certain weight or type of solder for my injector wires to be soldered together?

 

no

 

no, but 60/40 rosin core is about the easiest to work with, flows good at low temperatures. Lead free requires a really hot iron.

 

You should use butt connectors and heat shrink tubing. Solder is not good in motor vehicles, it makes the wires brittle and prone to fatigue failure.

 

Ditto that.

60/40 solder, shrink tube and liquid tape.

Solder wire, apply a thin coat of liquid tape to connection, slip shrink tube over connection, wait a min. or so for liquid tape to start drying, use heat gun to shrink tubing, it is a bulletproof connection. 94

 

i hear this alot but in most situations, solder is good enough and usually better than the average butt connector from the auto store.

 

This kind of depends on where you are but butt connectors don't work well over here in eastern canada, the salt gets in them and they turn green and corrode in less than a year.

 

Even with heat shrink tubing?

 

Even the really good perma-seal ones that come with shrink tubing and glue in them turn green after a while, I can't figure out how the stuff gets in, but it does. I never have any issues with solder and shrink tubing though, but i try to make sure the connection is somewhere in the middle of a harness, not next to a plug.

 

We build custom harnesses for hot rods and race cars, everything is soldered, even terminals that are crimped to the ends of leads get a "touch" of solder.

We use 2-3 main connection techniques, depending on application...

Most common, and when multiple leads are connected, is an uninsulated butt connector is used to crimp the leads together, it is then soldered to seal it up, the connection is then covered with liquid tape, shrink tube is slipped over the connection and heat shrunk.

The second most common is the "butt" connection, the wire strands of each lead are pushed together and a single copper strand is wrapped around the connection to hold the strands tightly together, it is then soldered to seal it, liquid tape is applied and shrink tube is shrunk over it, this method is used almost always when it is just 2 leads.

The third way is pretty much the same as the above, but is a "parallel" connection, the 2 lead ends are twisted tightly and "tinned", they are then connected together, [when possible] with a thin cooper strand and soldered, when space does not allow they can just be held together and soldered, liquid tape and shrink tube is then added.

We have literally 10s of 1000s of solder connection like the above without any failures. 94