I have been asked a few times whether eliminating unused wires makes any difference to the weight of the bike; so just how much does the wiring harness weigh, anyway?
There will be some differences year-to-year – this one in particular is from a 1980 CX500, and weighs 634gm. As you can see, there’s not any significant weight savings to be realised by modifying it; aesthetically you may be able to neaten the wiring up a little but please don’t begin such an undertaking lightly as there’s not actually all that much you can remove while still having a functional bike, and just carving bits out of it without a methodical process and lots of notes is just going to leave you with a huge headache and many hours spent staring at wiring diagrams later on…