I believe that in the past, there was a bit of discussion regarding OEM style wire connectors and the crimping of terminals, and the terminal removal from the connectors. I'm still consider myself virgin regarding the actual important bits that make a good harness. I do recall some of the tools being kinda not over-the-counter.
If one has to do any generic mending/splicing on the harness, I recommend non-insulated crimp connectors and shrink wrap.
I don't trust the Toyota wiring scheme. There needs to be a ground wire on the chassis of every traffic-related lamp. Also, the horns and horn relay. Toyota's updated H4 headlight relay probably isn't necessary if building it stock with new wire, but, it is an upgrade.
If one has to do any generic mending/splicing on the harness, I recommend non-insulated crimp connectors and shrink wrap.
I don't trust the Toyota wiring scheme. There needs to be a ground wire on the chassis of every traffic-related lamp. Also, the horns and horn relay. Toyota's updated H4 headlight relay probably isn't necessary if building it stock with new wire, but, it is an upgrade.