Yeah the wiring harnesses on these old KJs are really starting to crumble...there are plenty posts nowadays of electrical problems that end up being the insulation of a wire being scraped through to engine/chassis and causing a short or even several wires shorting together!
The problem is that you will need to replace your harnesses with ones from the same year/model KJ as the wiring...and wire colors...change between years and models. So even if you obtain harnesses from a Breaker Yard for your year/model...these replacement harnesses may be in a bad state....even worse than what you have already.
Heat and movement will break down insulation more rapidly so a low-mileage KJ may have reasonable harnesses!
There are Parts Fiches available on the colorado4wheel site so maybe if you find the correct part numbers the Dealers can help you.
Some owners here have wrapped their harnesses up with those Nylon tubes that look like corkscrews. Electrical suppliers or Builders' Warehouse have them in different diameters.
Best is to clean up any frayed wire ends by slipping Shrink tubing over the ends, soldering ends together and sliding the Shrink tubing over the join and heat with a Hairdryer or Heat Gun on Low Heat. Then wrap the harnesses with the correct diameter Nylon tubes and seal the ends with Duct Tape. You can try rescue any good protection covers you have existing on your Jeep and re-use them.
Try the Aussie site for KJs...they have basically the identical KJs as we have and there are plenty KJ Owners there!
www.ausjeepoffroad.com
Otherwise post your wiring issues here and I and the other Electronic Experts
will assist you!