I have most of my smaller wires soldered, but some of hte larger ones 8/10 guage I am having trouble doing a good solder job. These wires are primarily coming from the alternator, so would butt connectors be completely out of the question?

My other question is about the same style of connectors. I have heard many bad things about crimp style connectors, but then theres always people who swear by it. I dont want to suffer signal loss, but on a certain section of my harness, it would be a god send if I could put in insulated male/female quick disconnects, because of the location, and how frequent they may be moved in the future.

These are all wires going to the ECU, and again, I dont want to suffer any extreme attenuation, because im sure that kind of problem is hard to diagnose, so if anyone experienced in this could chime in and share thier opinions I would greatly appreciate it.