I worked at a LS wiring swap manufacture as the senior technical sales rep until recently. I also modified/repaired harnesses when we were short on workers because I had 35+ years in the automotive industry. We offered the AAW harnesses as a compliment to our swap harnesses and I was genuinely impressed with them. They came complete all the way down to the high beam switch and offered other add ons to make the installation easy. I never had a warranty issue with them. As far as rewiring your harness, if you choose that path make sure you have professional terminal crimpers, that makes all the difference in the world. If you don’t crimp properly you’ll fight to get the terminal into the connector, possibly having the wire pull out of the connector eventually (or worse staying in the connector but making intermittent contact) or you can compromise the dividers between the terminals in the connector. I can’t tell you how many customer harnesses I fixed over the years because they took it upon themselves to modify it and it came down to simple crimping issues. Rebuilding a harness can get expensive since you will be buying wiring in spools with multiple colors/gauges as you try to replicate the original wiring. The wiring you need would be high temp TXL and please, no Amazon connectors. Also the pins, connectors and such will start to add up because you either buy in bulk (lots of leftover parts) or smaller quantities which come at a higher cost. The last thing I’d like to point out is if you purchase a harness through AAW or Painless, if something does go wrong they have tech departments to walk you through the fix plus you get a warranty.