This is probably a good time to discuss terminating wire ends...
Here are the common crimp type terminals that I usually use when doing a wiring job. They are readily available and generally are fairly heavy gauge material. However, I absolutely despise the insulation on them. The color is awful and they look horrible when crimped.
So...I cut it off.
With the insulation gone, I can then crimp and solder the terminal to the wire. the trick with soldering automotive wiring is to use just enough to make a good connection. To much solder and it can wick back up the wire and make it hard and brittle.
With the soldering complete, I then add a small piece of heat shrink to cover everything up.
I know, I could just get non-insulated terminals and yes, that would save some tine. However, I have not been able to source a local store that carries them. Inevitably, I always run out or do not have the correct end so being able to go to my local parts store and get them is a nice convenience.