Where is the place to get high quality wire, ring terminals, splices, shrink tube, etc. Solder ready, uninsulated. Quality switches also.

Waytek

Duetsch makes nice connector kits. I really like their stuff. Delphi has nice stuff too and sells kits. If you want really good wire make sure it meets SAE J 1127 or 1128. If it does they will typically advertise it. I tested A LOT of wire in a previous life. It is not all the same stuff.

Delcity or Allied have a lot of selections.

Try to buy cross linked cable when you do if your wiring a whole car. It has better abrasion and pinch properties. If I remember right it will have a TLX designation. It's been a lifetime since I did testing, I use to know what they all meant and what their applications were for.

Barney B on here would be the best guy to ask as he probably buys in bulk and looks for good quality.

Good luck.

Will,
Check out these guys. They have the good tinned wire and connectors as well as lots of other stuff.

https://www.delcity.net/

For anything #12 and smaller I have been using the 3M heat shrink crimp fittings for a while now.

I recommend using crimp terminals that have the heat shrink crimp end. Helps protect the wire from corrosion and is just a little more work

Waytek, Delcity, Aircraft Spruce and Buyheatshrink.com are all places that I’ve used over the years.

Waytek and DelCity is who we buy all our stuff from.

Will, this fellow is here in AZ. Local to me. He has some very good stuff as well.
https://ceautoelectricsupply.com/

Marine wire is usually tinned and high quality. I can't remember exactly which site I got mine from, but it was a marine supply site, and cheaper than the ones mentioned above.

I get my stuff from The Electrical Depot. Very wide selection of stuff and great pricing.

Bill is correct. Don't overlook the marine supply places, especially if you are anywhere near the coast. The tinned wire and connectors are very good from these places.

Where I am we have a place called Englund Marine. Buy quite a bit of stuff from them. They have several locations along the West Coast.