1973 Dodge D-200 Time to hang a new harness

Just my opinion; YMMV, of course, but I have several older Mopars and I like to repair their wiring harnesses, not buy new ones, because I feel my repairs make them better than new. New harnesses are greatly overpriced, IMHO. I carefully solder in new, heat-resistant wire of a larger gauge than the original wire. I replace all the wires, not just some of them. I even went to the expense of buying the correct wire colors & stripes so anybody working on the car in the future can easily refer to the FSM schematic. My repaired harnesses look pretty much original, except for the larger gauge wires. I know you probably won't want to buy the correct color wires, of course, because wire is very expensive these days. I probably have about $1K invested in special wire for my Mopars, but I have used it to rebuild 4 Mopar harnesses, so it's all good.
One more thing: on old Mopars, problems with the fuse box are much more common than actual problems with the wiring harness, but often the two are confused, so the harness gets blamed incorrectly. Check your fuse box for voltage drop.