Electrical help needed, underdash wiring is a disaster

Same for my 1964 Valiant and 1965 Dart. Often the mess is made by "professionals" - mechanics and audio hacks. It probably isn't as bad as it looks. If taking the cluster out anyway, it isn't too hard to pull the whole harness out for bench work. That lets you clean up the bulkhead connector too. I hate butt crimps and always use solder & heat shrink. Unwrap the "welded junction" for the black ALT wires, which is a common problem area. It wasn't a true weld and is often a little green (corroded). I cleaned & soldered. I re-covered my wires w/ smooth PVC sheathing (Alpha or SPC) and split loom, sealing tee's w/ self-fusing silicone tape. For the factory look, buy non-adhesive vinyl wrap. Don't use sticky electrical tape (will make a later mess).